9to5mac has found evidence of export video to Facebook feature in iOS 4.0firmware. The code found in iOS 4 GM reveals that Apple is planning to include export video for Facebook from iPhone.
The code shows that the max height and width of the exported video will be 480p max with a max of 30fps frame rate.
Currently, the iOS 4.0 GM supports export video to Email, MMS, Mobile Me, and YouTube. Apple is going to release iOS 4.0firmware to masses on June 21st. Hopefully it’ll bring the Facebook export option as well.