Reddit

Founded by two students of the University of Virginia in 2005, Reddit has had 542 million monthly visitors as of March 2019, ranking as the No.6 most visited website in the US and No.21 in the world. 

Features:

• Contributing and sharing: Users can upload images, post memes, funny stories, news to the platform, making the content be shared and discussed, or just share and discuss posts by upvoting and downvoting content with other users.
• Chatting with the community: Official Reddit app supports Chat and Community Group Chat, and the talk is free, secure, and instant. The chat syncs across all your mobile and desktop devices so you can use it everywhere. Various chat room like r/Fortnite or one-on-one conversation is available where you can talk about science, movies, makeup, and sports.
• Getting interesting/trending/popular content: Users can join any community that you're interested in, asking for advice, and voicing your opinions. Or you can create a personalized by subscribing to your loving subreddits; thus, you can get a constantly updated stream of your favorite topics like fun stories, sports talk, and viral pics. You can find what's trending on Reddit by visiting r/popular.

Note:

By downloading Reddit's official app, you can more easily find the topics most relevant for you. Besides, the app has access to exclusive new features like Chat, Community Group Chat and more, so you don't need to worry about function limited.