To add to Vermented post above, I've been using Imgur.com for the past 2 years or so, per the recommendation of Mark in Texas at the time. Yes, it was a frustrating side ways/upside down photos that couldn't be corrected that made me looking for other alternative option.
So far, it has served me well; they don't include any adds along my photos, - so, nothing for me to cut off any garbage (commercials) - and they also let us choose the size posted on the forum; but can't be enlarged with a click however; once it's posted.