Everybody’s on Facebook. Well, not quite everybody, but your grandparents are, and that’s enough for you to know that gauging how many Facebook users are on WP7 gives you a pretty good idea of the overall number of people using the platform. WMPU have trawled the numbers for both the default Facebook integration, and the dedicated Facebook app, and the numbers aren’t exactly amazing. The former is sitting around 120,000, the latter around 84,000, even after a month of WP7 phones being in the wild.
However, even hough this may sound a bit low, WP7 is still only on two carriers, and the Christmas buying season isn’t quite up yet.