We have experimented with it a bit at www.nextproof.com. I wouldn't call it a "success", mainly because we've always had better conversions from (a) ads purchas

We have experimented with it a bit at www.nextproof.com. I wouldn't call it a "success", mainly because we've always had better conversions from (a) ads purchased on industry forums/blogs and (b) organic search referrals (we have decent serp placement and are getting better). All in all, I just don't know if it's worth it. I will admit, however, that we didn't create a solid landing page. That definitely could have had an effect. I'm experimenting with Facebook ads this week.