Forecasters of all sorts have been working overtime the past week or so, discussing floods in the U.S., Greece's economy, and elections in the U.K. Now here's a little something for the tech community: Pingdom has predicted that Twitter will process 6.7 billion tweets in January. Pingdom didn't base this estimate on a different company's growth pattern or some complicated formula. It didn't guess, either. Instead, a simple observation that there's been a 16.8 percent, 16.