If you have a Google account, you also get to upload photos that you can then create links for posting. I have only one so far on my account, but find it hilarious:
https://lh3.googleusercontent.com/aU...=w1025-h768-no
The only reason I know this works is because I used it in an earlier post after killing my Facebook account and had no way to share personal photos or photos from friends (as in this case). The one issue I had is that I had to put the photo in an album that is open to the public first.
In regards to storage space, this is what is listed in the Google Photos Settings:
I don't know how this compares to Photobucket, but I hope it helps.
Also, in regards to Dropbox, which I pay a pretty good penny for, I couldn't get a photo or video to embed on this post.