The LionsBase community membership requires a manual approbation by one of the moderators. Please help us by registering your Google+ account in your LionsBase personal account first. This is a simple operation described with screenshots in the documentation.
We are active on Twitter as well, with our account @lionsbase. Tweeting is for us a practical way of quickly announcing new features or informing about LionsBase as a whole. You should follow us if you are eager to be among the first members to know what's coming up.