Earlier quoted context omitted.
You may want to visit Mr. Poole's first website, 4chan, which requires anonymous posting on some areas but allows a limited identity in others (through tripcodes). The effect of anonymous posting on content quality is immediately apparent.
AH,good, someone in his own mind here. OP is pure wind, 4chan is full of shit, Google, FB, etc will never want this kind of content. I was on Usenet long time ago, you have some idle guys who would spend a lot of time turning all discussions into shit, allowing pure anon is giving them all latitude to do so.
Anonymity (or at least, properly contextualized identity) allows people to try out different identities and modes of creation. Removing all social context results in a smoothed out, lowest-common-denominator of personality, but it's the jagged edges and oddities that really make people interesting - or ugly.