I advertise through Facebook. I joined a lot of groups that allow advertising SFI and TripleClicks. However, you should be very careful in advertising via FB , because you may be blocked. You have to be careful what's in your ad text and absolutely advertise a blog and not direct links to SFI. You can not overdo it with the number of ads. I post twenty ads, and wait half an hour and then again twenty, and so on. I wish you a lot of success in advertising.