Facebook Home was launched on the 12th of April, the app managed to hit 500,000 downloads in the first 10 days, although it has taken a little longer for the App to reach one Million downloads.
Facebook Home hit the 1 million download mark a month after it was originally released, and considering the amount of users there are on Facebook, over 1 billion it would appear they app may not be as popular as Facebook had hoped.
Facebook’s other apps have seen more popular launches, their Facebook Android app has been downloaded between 100 and million million times, and their Instagram app managed to rack up 1 million downloads when it was launched on Android in just 24 hours.
Source Cnet