On any given day, President Michael Roth writes in paragraphs. Clear, complex blocks of prose that build one upon another into blog posts, essays or even, books, such this one, he’ll publish in May. Also, on any given day, President Michael Roth tweets. A cultural historian whose last two books numbered 336 pages and 224 pages respectively, Roth is now also expressing himself in 140 characters (or fewer) nearly every day, and has attracted a following of about 490 in the month since @mroth78 joined the Twitterverse. “I am really enjoying Twitter, perhaps more than I thought I would,” Roth said.…