It's a valid question.
Here's my reasoning:
Tenkar's Tavern is the name of the blog. Repeating it verbatim for the community page seemed... Boring.
Tenkar's G+ Tavern as one person mentioned looks silly.
I never planned on 2,000 Coppers taking a life of its own when I posted my mega dungeon experience, but it certainly did. A funny life at that.
So, why not embrace it? If its a penny for your thoughts, 2,000 Coppers should pay for a lot of them.
Besides, if I ever do a podcast, you know it will be called 2,000 Coppers ;)