Honestly we all can check the rankings screen for the numbers. Though with the lack of forum activity i've having a hard time gathering any information on the tribes. I know TFT has a fair number of inactives near me but i also know it has its share of good and active players as well.
IBS i know very little about
LOB i've been told i should join because its more active but that's just talk until its backed up with proof.
HOE well its small (when compared to the top 2) but its also at war with TFT
the rest hardly show up as a blip on my radar and that's combined.