Posting large photos on forum

Today I wanted to send a snapshot of my Desktop to the Kurumin forum but this site only loads images from a url.
So, I had to get somebody to host my photo.
I first tried ImageShack but it seemed only to provide thumbnails rather than the fullsized shot I wanted to post. Plus, when i put the generated url in the Kurumin Forum, the url didn't turn into a thumbnail in the preview. Perhaps this site doesn't handle thumbnails.
Then I had a look at Photobucket and this worked fine.