One of my favorite poker pros, who is also a Magic: The Gathering pro player, David Williams, has a Twitter account where he posts tournament updates that I always enjoy reading. I also follow updates from the M:tG Pro Tour on Twitter, and they're very informative. I think Twitter is a great thing for the game, it makes it easier to get every detail of a hand as it's so quick and instantaneous, that way nothing is glossed over. Just my opinion though.