I use Google+/Picasa. Very easy and lots of control with who you want to share the photos/albums with. Very user friendly.
Once you have the photo uploaded (you don't even have to use Picasa to do it) and tucked neatly into an album, you share it with whoever (the world, a group or one or two people). Of course you don't have to share it at all.
When you're posting a thread response and you need a picture, just open it up in Google+ (I save off the URL for all of my albums), open the picture, right mouse button to get properties and copy the url for the picture. Paste that URL into the thread using the picture icon and bingo!
I'd never want to give away the copyright to my images...
Here's a link to one of my
albums.
Here's one link to a picture I took on my way to the airport to see another RV (whew I had to tie it in).
Bob