To Tweet or Not to Tweet?

Went to Tweet some of my favorite Migraine links today, but Twitter has been "over capacity" for the last half hour. Now I understand that it's Sunday, and I understand that we don't pay for unsing Twitter, but it is monetized. So, what's the deal? This isn't an isolated incident. TIme for Twitter to invest in more server space or bandwidth or whatever it is they need to invest in to solve this problem.