Want to know when the old fashioneds are up? When the crullers are at their freshest? Polk Street staple Bob’s Donuts, which is open 24 hours and serves, arguably, the best doughnuts in town, recently launched a Twitter account: @whatsfreshest. It’s short on poetry, but you will be grateful to know that the “fritters are up” if you happen to be stumbling out of a nearby watering hole at 2 a.m. and can focus long enough on your phone to read Twitter.