Sideways photos:

Did you take them sideways and then rotate them before uploading them?

I've had that problem quite a bit, usually on facebook. For whatever reason, some photo sites will revert the photo back to it's original form. How they read this I do not understand, I'm not a computer geek. Only solution I've found is to convert them to bmps after rotating them and then convert them back to jpgs.

If you didn't take them sideways, I have no clue.