Facebook is an American online social media and social networking service owned by Meta Platforms. Founded in 2004 by Mark Zuckerberg with fellow Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes, its name comes from the face book directories often given to American university students. 

Facebook can be accessed from devices with Internet connectivity, such as personal computers, tablets and smartphones. After registering, users can create a profile revealing information about themselves. They can post text, photos and multimedia which is shared with any other users that have agreed to be their "friend", or, with a different privacy setting, with any reader. Users can also use various embedded apps, join common-interest groups, buy and sell items or services on Marketplace, and receive notifications of their Facebook friends' activities and activities of Facebook pages they follow. Facebook claimed that it had 2.80 billion monthly active users as of December 2020, and it was the most downloaded mobile app of the 2010s globally.

WhatsApp Messenger, or simply WhatsApp, is an American freeware, cross-platform centralized instant messaging (IM) and voice-over-IP (VoIP) service owned by Meta Platforms. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other content. WhatsApp's client application runs on mobile devices but is also accessible from desktop computers, as long as the user's mobile device remains connected to the Internet while they use the desktop app. The service requires a cellular mobile telephone number to sign up.

Messenger is an instant messaging app and platform developed by Meta Platforms. Originally developed as Facebook Chat in 2008, the company revamped its messaging service in 2010, and subsequently released standalone iOS and Android apps in August 2011 and standalone Facebook Portal hardware for Messenger-based calling in 2018. Later on, Facebook launched a dedicated website interface known as Messenger.com, and separated the messaging functionality from the main Facebook app, allowing users to use the web interface or download one of the standalone apps. In April 2020, Facebook officially released Messenger for Desktop, which is supported on Windows 10 and macOS and distributed on Microsoft Store and App Store respectively.

Messenger Kids is a messaging app and platform released by Facebook, Inc. (now Meta Platforms) in December 2017. The platform is designed for a young audience as a safer alternative to the Messenger platform. Users can register with their first and last names instead of phone numbers. It was initially launched for iPad tablets with the iOS operating system in the United States only, though later support for iPhone and Android devices was added and it was rolled out in Canada, Peru, and Mexico.

Parents have oversight and control, with requirements about identity verification and approval of contacts. There are no in-app purchases nor advertisements, and thus also no data collection for advertising purposes, children's accounts are not visible in search on Facebook, and the child's account does not automatically migrate to a full Facebook account once the child turns 13 years old (the minimum age for Facebook registration). It features augmented reality filters and lenses, along with games and educational content.

TikTok, known in China as Douyin (Chinese: 抖音; pinyin: Dǒuyīn), is a video-sharing social networking service owned by Chinese company ByteDance. The social media platform is used to make a variety of short-form videos, from genres like dance, comedy, and education, that have a duration from three seconds to one minute (three minutes for some users). TikTok is an international version of Douyin, which was originally released in the Chinese market in September 2016. Later, TikTok was launched in 2017 for iOS and Android in most markets outside of mainland China; however, it only became available worldwide after merging with another Chinese social media service, Musical.ly, on August 2, 2018.

Snapchat is an American multimedia messaging app developed by Snap Inc., originally Snapchat Inc. One of the principal features of Snapchat is that pictures and messages are usually only available for a short time before they become inaccessible to their recipients. The app has evolved from originally focusing on person-to-person photo sharing to presently featuring users' "Stories" of 24 hours of chronological content, along with "Discover," letting brands show ad-supported short-form content. It also allows users to keep photos in the "my eyes only" which lets them keep their photos in a password-protected space.

Snapchat was created by Evan Spiegel, Bobby Murphy, and Reggie Brown, former students at Stanford University. As of March 2020, Snapchat had 229 million daily active users. On average more than 4 billion Snaps are sent each day. Snapchat is known to be popular among the younger generations, particularly those below the age of 16, leading to many privacy concerns for parents.

Telegram is a freeware, cross-platform, cloud-based instant messaging (IM) system. The service also provides end-to-end encrypted video calling, VoIP, file sharing and several other features. It was launched for iOS on 14 August 2013 and Android in October 2013. The servers of Telegram are distributed worldwide to decrease frequent data load with five data centers in different regions, while the operational center is based in Dubai in the United Arab Emirates. Various client apps are available for desktop and mobile platforms including official apps for Android, iOS, Windows, macOS and Linux (although registration requires an iOS or Android device and a working phone number). There are also two official Telegram web twin apps – WebK and WebZ – and numerous unofficial clients that make use of Telegram's protocol. All of Telegram's official components are open source, with the exception of the server which is closed-sourced and proprietary.

Telegram provides end-to-end encrypted voice and video calls and optional end-to-end encrypted "secret" chats. Cloud chats and groups are encrypted between the app and the server, so that ISPs and other third-parties on the network can't access data, but the Telegram server can. Users can send text and voice messages, make voice and video calls, and share an unlimited number of images, documents (2 GB per file), user locations, animated stickers, contacts, and audio files. In January 2021, Telegram surpassed 500 million monthly active users. It was the most downloaded app worldwide in January 2021 with 1 billion downloads globally as of late August 2021.

YouTube Kids is an American video app and website for kids developed by YouTube, a subsidiary of Google. The app provides a version of the service oriented towards children, with curated selections of content, parental control features, and filtering of videos deemed inappropriate viewing for children aged under 13, 9 or 5 depending on the age grouping chosen.

First released on February 15, 2015, as an Android and iOS mobile app, the app has since been released for LG, Samsung, and Sony smart TVs, as well as for Android TV. On May 27, 2020, it became available on Apple TV. As of September 2019, the app is available in 69 countries, including Hong Kong. YouTube launched a web-based version of YouTube Kids on August 30, 2019.

LinkedIn is an American business and employment-oriented online service that operates via websites and mobile apps. Launched on May 5, 2003, the platform is primarily used for professional networking and career development, and allows job seekers to post their CVs and employers to post jobs. As of 2015, most of the company's revenue came from selling access to information about its members to recruiters and sales professionals. Since December 2016, it has been a wholly owned subsidiary of Microsoft. As of September 2021, LinkedIn has 774+ million registered members from over 200 countries and territories.

LinkedIn allows members (both workers and employers) to create profiles and "connect" with each other in an online social network which may represent real-world professional relationships. Members can invite anyone (whether an existing member or not) to become a "connection". LinkedIn can also be used to organize offline events, join groups, write articles, publish job postings, post photos and videos, and more.

Discord is an American VoIP, instant messaging and digital distribution platform designed for creating communities. Users communicate with voice calls, video calls, text messaging, media and files in private chats or as part of communities called "servers." 

Servers are a collection of persistent chat rooms and voice chat channels. Discord runs on Windows, macOS, Android, iOS, iPadOS, Linux, and in web browsers. As of 2021, the service has over 350 million registered users and over 150 million monthly active users.

Postman is an API platform for building, testing and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs—faster.

Canva is a graphic design platform, used to create social media graphics, presentations, posters, documents and other visual content. The app includes templates for users to use. The platform is free to use and offers paid subscriptions such as Canva Pro and Canva for Enterprise for additional functionality. In 2021, Canva launched a video editing tool. Users can also pay for physical products to be printed and shipped.

In June 2020, Canva raised A$60 million at a valuation of A$6 billion; almost doubling its 2019 valuation. In September 2021, Canva raised USD $200 million and announced a valuation of USD $40 billion.

Tinder is an online dating and geosocial networking application. Users anonymously "swipe right" to like or "swipe left" to dislike other users' profiles, which include their photo, a short bio, and a list of their interests. Tinder uses a "double opt-in" system where both users must have "swiped right" to match before they can exchange messages.

Sean Rad founded Tinder in 2012 at a hackathon held at the startup incubator Hatch Labs in West Hollywood. By 2014, Tinder was registering about one billion daily "swipes" and reported that users logged into the app on average 11 times a day. In 2015, Tinder was the fifth highest-grossing mobile app, and in 2019 it surpassed Netflix in annual spending. 

In 2020, Tinder had 6.2 million subscribers and 75 million monthly active users. As of 2021, Tinder has recorded more than 65 billion matches worldwide.

Reddit is an American social news aggregation, web content rating, and discussion website. Registered members submit content to the site such as links, text posts, images, and videos, which are then voted up or down by other members. Posts are organized by subject into user-created boards called "communities" or "subreddits", which cover a variety of topics such as news, politics, religion, science, movies, video games, music, books, sports, fitness, cooking, pets, and image-sharing. Submissions with more upvotes appear towards the top of their subreddit and, if they receive enough upvotes, ultimately on the site's front page. Although there are strict rules prohibiting harassment, it still occurs, and Reddit administrators moderate the communities and close or restrict them on occasion. Moderation is also conducted by community-specific moderators, who are not considered Reddit employees.

As of September 2021, Reddit ranks as the 19th-most-visited website in the world and 7th most-visited website in the U.S., according to Alexa Internet. About 42-49.3% of its user base comes from the United States, followed by the United Kingdom at 7.9-8.2% and Canada at 5.2-7.8%. 22 percent of U.S. adults aged 18 to 29 years, and 14 percent of U.S. adults aged 30 to 49 years, regularly use Reddit.

VLC media player (previously the VideoLAN Client and commonly known as simply VLC) is a free and open-source, portable, cross-platform media player software and streaming media server developed by the VideoLAN project. VLC is available for desktop operating systems and mobile platforms, such as Android, iOS and iPadOS. VLC is also available on digital distribution platforms such as Apple's App Store, Google Play, and Microsoft Store.

K-Multimedia Player (which is commonly known as The KMPlayer, KMPlayer or simply KMP) is a media player for Windows, iOS and Android that can play most current formats, including VCD, HDML, DVD, AVI, MKV, Ogg, OGM, 3GP, MPEG-1/2/4, AAC, WMA 7, 8, WMV, RealMedia, FLV and QuickTime. It has a significant user base, and has received positive ratings and reviews on major independent download sites such as Softonic, Adobe and CNET. 

KMPlayer is supported by a wide range of advertisements, including in the homepage, dedicated side panels, the options panel, and pop-ups.