Posting "normal" images: Maximum Size: 7 megabytes; Maximum Length: 3500 pixels; Minimum Length: 250 pixels.
OK, we all understand that. Now. I want to post a panorama. No problem, except that it looks pathetically small on screen. So the obvious answer? Post a large-size panorama, using the "Large Post" option in Manage Photos section. But here the advice is: Maximum Size: 400 kilobytes; Maximum Length: 4000 pixels. So the large panorama can only be a 400 kb file!!