|I have a mac computer. Every time I have posted a review with a portrait style picture its appeared horizontally. Rather annoying. I've noticed it happens to other people as well.
However, I've discovered a fix. Instead of uploading the photo straight from your camera, upload it first on to your computer. I upload it to Iphoto.
Then upload the photo from your computer. Voila, it's a vertical portrait photo. Not quite sure why this works, but it has for me! For proof look at my reviews, the recent photos are all the right way round.