There is a recent [post][1] on MO that includes two new tags: Beer and Bet!  The problems of these two tags aside, I don't think it is a good practice to add new tags unless it is absolutely necessary. Is it possible to add a feature in which a number of MOers (for example, three users) should agree with the introduction of a new tag before its use? 


  [1]: http://mathoverflow.net/questions/143082/if-a-conjecture-is-proved-then-is-it-solved-proved