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Posting every day or two on blogs with relevant content I've found works a treat. First, you become more knowledgeable plus you're getting backlinks for posting on something which interests you. Good comments also sometimes get people clicking your links too (as well as track-backs)
As far as I'm aware there's no invite limit, though obviously it's a good idea to invite people who are more likely to invite others. Ideally I'd like to move away from facebook also. The way they tried to prevent plugins which allow you to export your friends just shows how control hungry they...