Hi all,
http://goo.gl/B0hWl0
That's a readable copy of a Google Docs spreadsheet. In it I've added some data on 206 guilds active on the evening of 01/16. All I tracked were guild tags, current active players, and total membership.
Feel free to review. There are a lot of single-digit activity guilds out there, lots of small purpose-built crews, and an awful lot that don't have the manpower to form full coil teams.
Seems like people mostly use FCs like Linkshells.