OKCupid does something similar with attractiveness: they email you to congratulate you if you're one of the top 50%. Based on all my friends who have bragged, it works. I always thought that was a great way to flatter people into using the site.
I came here to post this. I just found the email I received back when I was single, specifically on 10/12/11, and this is what it looked like: http://cl.ly/image/2A2N41383T38
This was clearly an ego boost, though not something you tweet about or post on Facebook (the taboo of online dating + sounding like a major douche).
OkCupid has been doing stuff like this with data for a really long time and they deserve some credit as well.
Based on the text they're going to recommend more attractive people to one another... I wonder if couples' attractiveness is highly correlated. That would be some interesting data. They should publish it.
