Would you buy a smartphone designed and sold by Facebook? Because it’s coming:

Facebook just invited press to an event at its headquarters on April 4th to “Come See Our New Home On Android”. Sources tell us it will be a modified version of the Android operating system with deep native Facebook functionality on the homescreen that may live on an HTC handset. The evidence aligns to say this is the Facebook Phone announcement people have been speculating about for years.

One source recently told us to be on the look out for a Facebook mobile press event in early April where the social network would reveal an altered Android OS running on HTC. It’s said not to be a full-on rewrite of Android, but rather a “flavor” that will have all sorts of extra Facebook functionality built in.

I’m worried that extra functionality is nothing but Farmville invites.