Personalized Social Network

A lot can, and should be said about the value of personalized approach in the web experience, from purchasing (Amazon recommendations) to social networks.
The cynics would talk to the mechanics of it (sure, pulling out your purchasing history or birth date is a mechanic matter of a database query), however, when I opened Facebook earlier I had a moment of "STOP! Reality check" (in this case, a very pleasant one).

Thank you Facebook (and my friends), you made my day.