Threadster 

A member of a board who starts/authors a thread on such board.

Out of respect for the threadster, we should refrain from subjects considered to be threadjack or off topic.

Threadster by Jonathan Corley January 12, 2004

Threadsterbating 

When a person posts a status on Facebook and then post multiple comments below their own status, thereby, having a thread with themselves.

Dude, I logged into Facebook yesterday and my newsfeed was clogged with my friend threadsterbating. I felt like I had walked in on something dirty.

Threadsterbating by Sefirox November 23, 2011