Use Flickr, admittedly you have to sign up to a Yahoo email address, but that's all I use it for, it is simple to upload and the picture links you back to a larger version. I have stopped using my Photobucket account and will close it soon.
Here is an example of one of my recent photographs I took that if you click on it, it brings up a larger image, I can chose the size of the image I post in threads, as shown below, a simple click on it, it takes you to Flickr and a larger image, even larger versions are also available, stuff I found impossible on Photobucket.
NOT A CAPTION ENTRY