Threads, typically, are meant to offer some sort of discussion or involved participation (such as in the Eden Games section). This isn't Facebook and random "Hello!" and "Good night!" messages (as well as variants thereof) aren't encouraged. About the only time I can think of a thread that doesn't really offer much discussion is when it's someone in the Upgrade Request forum asking for an upgrade or someone in the Welcome forum introducing themselves as a newbie. Otherwise, even in the Social section (which is sort of the catch-all forum for threads which don't have a specific forum), threads should offer discussion.