It may have been 3 a day at its very earliest inception 10 yrs ago but that was because a few ppl were flooding the photos. Not just 4 or 5, we're seriously talking 20+ photos.

As NJ said, if you are dying to post more than 3, please wait till other ppl post so it gets spread out. It can be hard when it's slow too. Back when, it could take days for a new photo to show up.