My company is relatively small so we don't spend a huge amount on marketing each month. We do SEM, PR, etc. I've had a couple colleagues really push the idea of using retargeter.com or other to hit visitors to our site with advertising on other sites. I have to say given the modest traffic we get my gut reaction is that it just doesn't make sense.
Anyone with experience? Are there traffic levels a site should be getting before you'll really see a return by using the service?
Love any thoughts.