I don't see anything wrong by make a tweet. Theymos might as well as check security of @bitcointalk twtitter account while he's as it.
One of the few uses of the Bitcointalk Twitter account is to notify whether the forum is down.
If the forum is down, I'll know when it doesn't load

I don't need Twitter for that.
I agree. But it'd be great to know additional information such as expected downtime or any damage/loss (such as recent post is corrupted).