Only twits and social network junkies actually care about this
When I do internet searches, I am not looking for twits, facebook or myspace trash. I am looking for information. I don't care to hear about some crazy persons opinions, if I did, I could log into myspace or facebook (I refuse to join twitter, I don't see any use for it) and read hours worth of gibberish from people I barely know.
I actually would enjoy never seeing any search result from those three social networking sites ever again, they have no real information.
it is not a monopoly, there are other search engines you can use (although they are pretty crappy).