I think Quora have done a really good job bringing together its own format with a working advertising system. The ability to target single questions and topics is especially a very nice targeting feature to avoid spending budget on questions we don't want Review collected by and hosted on G2.com.

I feel like it sends over a lot of invalid traffic. We get a surprisingly high number of clicks for very very low CPCs, but when you look at it on Analytics, it always shows 90%+ bounce rates and low engagement times. Review collected by and hosted on G2.com.