I am not very well versed in other platforms but IBOtoolbox is a great place to start your social media marketing. Everything you do in IBOtoolbox is indexed by the search engines and seen by people outside of the IBO platform. As a matter of fact 97% of the traffic to IBO is from non members.
Inside the IBO platform you can meet other online marketers, develop relationships, and get great advise from a variety of marketing experts in all fields of internet marketing, including social media. The people at IBOtoolbox are always happy to help in any way they can.