I have Imgur, but found it awkward that random people started commenting on photos I posted in a car forum, that they aren't a member of. I've changed the privacy settings, since.
Since the demise of Photobucket's image hosting, I've helped edit hundreds of posts to restore the photos to the threads for users whose images have disappeared. Flickr.com seemed a lot easier to use than Imgur, Postimg.org is a real pain, you can't look at a users' album.
With Tapatalk, you can upload on the run, but you can't go back to look at the images that you've downloaded to re post them, unless you copy the link from your original post.
So for now, I use Tapatalk for trivial stuff, then upload the photos to Flickr.com to store images I may want to re-post in the future.