From my parent note:

Stuff like asking people to pick tags when they create the account and 
whatnot, is not useful *yet* because the content simply does not exist. 
What's the point of me picking a bunch of tags that deeply interest me 
like "linguistics", "Catalonia", "seafood", "knives"... if there's 
nothing or nearly nothing about any of them -- yet? In the future, yes. 
But right now it's not worth wasting time on this.