http://www.talkphotography.co.uk/forums/showthread.php?t=327107
similar was asked last week, but I don't know if a definite answer was established
Higher Resolution
Starting today, we will be rolling out support for print-quality, high-resolution photos. And unlike on many other online services, you don't need any kind of premium or paid account.
We're increasing the size of the photos stored from 720 pixels to 2048 pixels on the largest edge, for an 8 times increase overall. I'm really excited to be launching this feature.
Anyone any other thoughts re FB photos?