IMO - Google was genius to figure out that users are more than happy to click on relevant text-only based ads... But anyone use Facebook? I get so many more clicks if I have an image. Facebook users definitely love pictures.
I've used adwords and my money was gone quickly when I used it. I also lost my $20 free advertising clicks from bidvertiser very rapidly too. I didn't have any further money to put for facebook ads. But I'm sure it's a good move with the click generation I received in the past for other sites.
Definitely Pictures on facebook for me too. I think since they're on the side if you have an eye-catching picture but since the majority of facebook users are young, pictures are the best :>