I like being contrary, so I'll take the side of Facebook advocacy: by "showcasing," as you say, Friendfeed makes their service far less efficient, and to some degree less valuable. It adds nothing but a place to visit everything at once, which means that it hurts the communal aspects of those other sites and reduces the visual efficiency of each. Facebook, on the other hand, centralizes everything, which means that as a user you can use it and only it and have everything you need. I have relatives who use Facebook because it's so easy to understand.

Also, what does it mean to effectively aggrandize collective genius?