Just a little more than a month after Facebook purchased Instagram for $1 billion, the company has strangely launched a very similar app today. Hitting the App Store right now, Facebook Camera can be best described as Instagram for Facebook photos.

Users of the app can post multiple photos from their camera roll at one time. High-resolution photos of up to 2048×2048 can also be uploaded with the app.

And in the most Instagram-like feature, Facebook Camera allows users to crop and apply filters to give photos a different look.

Other features include the ability to scroll down a single feed of all your friends’ photos and see pictures from the different apps your friends use. Users can also tag friends, add photo captions, and say where a photo was taken.

Facebook Camera is free and can be downloaded from the App Store now. It is designed for the iPhone and iPod touch but does work with the iPad. As of right now, I can download the app via iTunes, but it is not appearing in search results on my iPhone. That will probably change soon.

Are you as puzzled by this move as I am? While the Facebook acquisition of Instagram was done very quietly, why would Facebook still launch an app like this?