sharing depression doesn't posts immediately implies attention seeker. I've done it and I am actually really depressed. It can actually help in some ways. Meeting new people and getting help because you have no one around to actually help.
I am not a scene or emo. I am just actually a normal person with depression but sharing stuff does help in certain cases however more often than not a lot of these people actually aren't but you still shouldn't generalize as some actually are.