Microsoft [MSFT] hasn't released any official numbers yet about how the new Windows Phone 7 operating system is doing. However, WMPowerUser managed to grab some statistics from the WP7 Facebook app that shows how many users are active in using that app.
The graph above shows how many Windows Phone 7 users accessed the service while the second graph shows how many users installed the Facebook All (which is the second most popular app in the app store).
Although not everybody will use Facebook on their WP7 smartphone, a good portion of users will and if thats the case, sales numbers aren't looking too good. Microsoft wants to hit 30 million sales in the next year, right now they look to have almost 29.9 million to go.