There's a button when creating a thread which says "OC" with no further explanation. I've seen "OC" noted to the left of thread titles, presumably because somebody has ticked "OC". What does it mean??!
I like being able to flag something as OC but it assumes good faith. I'm not sure how useful tagging something as OC is, I'd often find myself look at the person's post history, linked websites, etc.
It's a way to say "the person sharing this is also the person who made it, and didn't just find something someone else made and posted it because they liked it or felt that it was relevant or shareable". Like if you're in a band and post one of your own songs, that's OC. If you post a new song release from a band you like, that's not OC.
Hovering tooltips would be helpful for this kind of thing. The other day I was staring at the PURGE button next to READ ALL on the notifications listing. I assumed READ ALL meant "mark all read" but PURGE was more ambiguous. Finally I just PURGED to see what would happen.
Answer: READ ALL ghosts out the posts but they are still clickable. PURGE removes all the posts from the notification list.