Let’s face it — Twitter couldn’t possibly be bigger right now. Practically everyone at SXSW is using it by the minute, it’s pulling in new funds during a tight credit crunch and even a politician that was born long, long before the advent of the Internet is about to do an interview on it. Life’s good in the Twitterverse, and it’s about to get serious at noon eastern time today.ABC News’ George Stephanopoulos is gearing up to conduct an entire interview with the Republican party’s most recent presidential nominee,