I use Flickr it’s so easy to use but even easier and no account needed is Imgur.
Flickr is completely broken when used with iOS; you used to be able to upload directly from Photos, and you could tap with two fingers in the image URL window to select all, but you can do neither now.
Photobucket at least lets you do that, but on selecting and copying the URL, it locks up, so I have to go out of the app then reopen it, been like that for ages.
Using iOS 9.1 on an iPad 3.
Hmmmm, just did a bit of googling, and it seems that Flickr has the rather short-sighted policy of not officially supporting mobile Safari, directing users to either the desktop version, or the app.
But as the app won’t allow the selection of bbcode for sharing, that renders the use of Flickr on the most widely used mobile platform effectively useless.
Idiots.