A social news site run by startup accelerator Y Combinator where users submit and upvote links about technology, startups, and programming, ranking them on a community-driven front page.

A community platform, owned by Stripe, where independent founders share their startups' revenue, growth, and stories, with rankings of top products and milestones.

A website that tracks and ranks thousands of cryptocurrencies by market capitalization, price, and trading volume.

A Google-owned platform for data science and machine learning competitions where participants submit models and are ranked on public leaderboards.

A blockchain-based prediction market where users trade shares on the outcomes of real-world events, with market prices reflecting the crowd's collective probability estimate.

A review-aggregation website that assigns a weighted average score, called a Metascore, to video games, movies, TV shows, and music based on critic reviews.

A publicly traded web analytics company that estimates and ranks website traffic and engagement across the internet.

A curated platform that showcases pre-launch and early-stage startups to an audience of early adopters and investors.

A long-running technology news and discussion site where user-submitted stories are ranked and commented on using a community moderation system.

A forecasting platform where users predict the outcomes of future events and are ranked by the accuracy of their predictions over time.