Hey Jay.. I have hit social 2.0 sites in mainstream and adult. I did/do get traffic from it, always some but not always a lot.
I finally figured out what the largest advantage was, in my opinion. Yes, sometimes you will get bursts of traffic - however you always get free backlinks, and with very little social interaction from visitors it can create free-easy-continual backlinks.
Adult and mainstream wise, I did not do so well directly trying to make money from the traffic, but the advantages to easy backlinks was clear.
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