I like IBOtoolbox because I met so many good people there and I've learned a ton from them through their PR's, many of which are related to their experiences out there on the net. I believe every day is a learning day and there are many great marketers at IBOtoolbox sharing their stories and educating while entertaining.
I also like the advertising system they have in place of course, and the consistent improvements to the IBO platform that Kris and her development team make. I also love being associated with a "forward looking" group that benefits all us IBO members through the marketing tools, IBO system and the constantly evolving innovation. As a social site, I actually have more fun and I learn more at IBO then I do on Facebook or Google+.
A really great question George, have a great day there!