Recently, there was lot of interest in Dunbar's number.
Prof. Dunbar from Oxford University claims that one is capable to manage up to approximately 150 stable social connections. When you reach your personal limit, every additional friendship is either doomed or comes instead one of the existing relationships.
Social network applications company Yedalab (of which I'm one of the founders) released a new facebook application "Do You Know Your Friends". It comes to check the simplest aspect of the friendship - can you recognize your friends by looking at their profile pictures? After 16 profile pictures, the application shows to the user the misidentified friends and the recognition success rate. Users can also see how they have done relative to the general facebook average.
Although the application was just released, we can already get the first impressions about people knowing their facebook friends. It turns out that we are able to recognize 3 out of 4 friend's profile pictures. The situation is not so positive for all users. If you have less than 250 friends, you'll probably recognize 4 out of 5 your friends. On the other hand, if you have more than 500 friends, recognizing 2 out of 3 friends will be considered as success.
It only takes a few minutes to test yourself, but, in some cases, it takes much longer to decide what to do with the result.
You can test yourself here: http://apps.facebook.com/douknowurfrnds/index.php
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