Top 25 Facebook App and hybrid business models

I remember when I first learned about LinkedIn.com, and was the 4th person to sign up for it in Utah County. Soon I got into a competition with two friends to see who could end up with the most (real) connections. I finally won that competition, but we all ended up with hundreds of connections. But I remember when one of my friends knew they were losing on the connections number that they claimed to be winning on "endorsements." They changed their key metric, so that they could claim that they had actually won.