I just snapped a super-cute photo of my wife wearing a Santa cap, which she wanted to use as her new Facebook profile picture.
However, after she uploaded it, she discovered that Facebook wouldn't let her rotate it--so she was a sideways Mrs. Claus.
After fiddling around for a bit, I discovered that Facebook lets you rotate some photos, but not others. Why? No idea. Fortunately, it's very easy to rotate pix before you upload them. Here's how:
1. If you haven't already, save the picture to your hard drive (preferably in an easy-to-find folder like, say, Pictures).
2. Open Explorer (Windows-E), navigate to the folder containing your picture, then find the one that needs rotating.
3. Right-click the picture, then choose Rotate clockwise or Rotate counterclockwise. Windows will immediately make the change.
4. You can do this with multiple photos if necessary. Just hold down Ctrl while clicking each one (that's how you select multiple files), then right-click any of the selected files and click as described in Step 3.
Obviously this works for any photo-rotating needs, not just Facebook profile pix.