Facebook - I deleted 500 friends and didn't like it.
3.7k followers on LinkedIn - how does this algorithm work again? Talk to me on LinkedIn.
CoffeeSpace - coffeespace.com. I saw it, didn't use it. Inspired me to make seeddate.com late one Thursday night :)
Y Combinator Co-Founder Matching app - Hard to beat the network, reach, and brand of Y Combinator. Check out Startup School's Library (ycombinator.com/library) if you haven't yet for the second-greatest startup content library on the web (#1 goes to Stanford Technology Ventures Program, stvp.stanford.edu)
Tinder - !!!
Bumble - The interview says it all.
During my graduate school years, I thought about the person matching problem a lot. I was part of a loose startup innovation community in San Francisco and hung out at hacker houses in the South Bay.
Look at the code on GitHub - Cracking the contract algorithm seems to be the hardest part :)
Writing the profile
Looking at matches, swipe style
Make it responsive
What to do once you're matched?
Y Combinator made a public online guide to YC's Co-Founder Matching platform - some good insights here for the business co-founder matching problem.
Facebook 5,000 Friends Limit - Techcrunch 2008
How Facebook beats MySpace - The Guardian 2009
The role of angels in founder matching - article pending :)
How many users does a startup need to be #profitable? - Kevin Kelly "1,000 True Fans" 2008