We get a ton of traffic from ask.com. I had answered a question some time ago regarding where to buy a certain product stating to visit my web site and started receiving steady traffic from it.
I then created a few different accounts just to ask more related type questions and to then answer them from different accounts with my web site as the answer to see the results of traffic. The results have been really quite impressive and steady.
This was a traffic source that I literally stumbled on but has provided very good results over the course.
I have not tried this with adult, but for mainstream it has proved a very worthwhile traffic source and even more importantly a steady sales engine.
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