How do you stay "on top" of things as they're being planned or announced? While the official Comic-Con International website has the panel schedule, exhibitor lists, locations and maps, that doesn't begin to cover all of the things going on in and near the convention. In this instance, Twitter is your friend. You can find things related to your interests by following certain "hash tags", such as #SDCC or #_your_favorite_thing_here_. I'm @TNgirlinWA if you wanna follow me. :)
Who should you follow? (See suggested list, below.) It can depend on where your interest lies, really. If you're a big movie or television fan, you'd want to find the Twitter accounts for the companies that make the movies or TV shows you like. Following the official movie or TV show Twitter accounts, or actors/actresses from the film or show, can also keep you in the loop. If you're interest lies in comic books, you may want to follow the publishers, writers, and artists of your favorites. If you're a gamer or collector, check to see if the exhibitors have Twitter accounts, as they may have exclusive, limited time offers announced throughout the convention. Then there are the places who dig up and report all sorts of various SDCC-related news items and share them with the Twitterverse.
*Here's a partial list of recommended Twitter accounts you may want to follow for SDCC (please leave comments to suggest more so I can have as comprehensive a list as possible):
GENERAL SDCC NEWS & TIPS:
@comic_con (official Twitter for Comic-Con International)
Of course, when you go to San Diego for Comic-Con, don't forget that there's a whole lot more to experience in the city than just the convention.
AROUND SAN DIEGO:
*Note that some of these Twitter accounts could fall under more than one category. Basically? That just means more bang for your...tweet...or something.