In reply to Grover.

Grover,
We host our SAS blogs using WordPress. WordPress is backed using a MySQL database. SAS can access MySQL easily, so I can run reports and tell you that we have over 5089 posts on blogs.sas.com (as of right now) and 7,127 comments (oops, your new one plus my response makes 7,129).

G+ has a more complex API that I haven't tried to tackle. I'm not sure what Pinterest or LinkedIn offer, but I'm sure they have something.