Noosfeer!

StumbleUpon discovers web sites based on your interests, learns what you like and brings you more. Using a combination of human opinions and machine learning to immediately deliver relevant content, StumbleUpon presents only web sites that have been suggested by other like-minded Stumblers. Each time the Stumble button is clicked, the user is presented with a high quality web site based on the collective opinions of other like-minded web surfers.

TopTopic is an online community where members earn revenue from their posts, comments and moderation activities. Rather than run ads, we use member up-voting (no down-voting) to both raise the exposure of content, and drive revenue to the creators.

ZapChain is a collection of communities where you can earn Bitcoin for posting great content and joining discussions.

Old Pluto started as a pet project that I created for fun. I'm a software developer and a news junkie, so originally, I wanted to build a simple RSS aggregator for helping me find interesting news. As I used the website, I kept adding features anytime I needed something, and eventually with change after change, Old Pluto evolved into something more.

Democratic non-profit news aggregator.

An unmoderated discussion forum anyone can join.

SpotterBoard.com give their members an opportunity to get a personalized homepage & menu regarding interests that they've chosen to follow. Interesting websites, simple and clean user interface and a community based voting system will keep you interested in coming back to the page for days.

CornerHub is a social network. Create discussion topics, follow other users, share your updates, photos, videos and music. You can create the groups.

ForumPromotion.com; a bookmarking & social networking curation hub, but also the easiest way to discover new and interesting forums across the Web. Anyone can submit, vote up/down, and comment on links. The most trusted forum promotion platform & topic curation community. All The best message board threads, all in one place. 100% free!

Twincl is characterized by forum (including link sharing), Q&A, review and blog sites, using CommonMark as its writing format. Twincl features innovative Markdown editing, topic trees, voting/remarks, selected posts, senior authors, logarithmic scales, and more.