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Not yet... but it is quality not quantity I care about here, or for any fansite, so membership numbers should not be a priority as you can lose focus chasing up new members (who never come back to interact) instead of keeping people active, as I believe people should have some choice for interaction, and not be targeted, or forced to interact on just one site.
I just went and had a look at the numbers, to see if it was true that the TCCA was the largest group, and they have just over 1,600 registered members, while we have had just over 4,200 registered members at this current location (plus about a couple thousand more in the 10 years before this location, on our previous sites), and it is more of a deterrent to type out a registration form and follow email instructions on a messageboard site like ours than click to join a facebook page (and since our Ozformers facebook page is an open page and not a closed community page, we'll never know how many extra people who aren't members here, are viewing that page as well).
But as noted above, I honestly don't keep track of our numbers or anyone else's, as I concern myself more with the number of "active members", who keep coming back (at least once a week) by generating more topics and posts here to make it more interesting for other people to register and want join in to voice their opinion... as all fansites and facebook pages get people joining up and then never coming back (after a post or two, or not at all). Our site has about 10% active members (300-400 people logging more than once a week), so that would be a percentage you could apply to any other fansite as well, if their site doesn't show the exact statistic.
Realistically, I would expect to see similar active numbers on various local sites, if they are kept interesting, active, inviting and non-combative against other fansites that even competing against them.