Ok, to have things sorted and to avoid missunderstandings/mixups here some explanation to thread tags, what they mean and when they should be used:

[Reaper] - This tag shows that only Reaper members should post at this thread
[Poll] - Polls where everyone is allowed to vote
[Clanpoll] - Polls where only clanmembers are allowed to vote
[Event] - Events, free for everyone to join (public events)
[ClanEvent] - Clan internal events, only for members
[App] - Application polls/threads. Only members are allowed to vote there.

For our visitors: Using tags for threads is only allowed for members. Don't tag your own thread.