Twitter's ubiquity, rising membership, and still-developing business model present great challenges and opportunities for its first VP of communications. Jason Shuffler reports

One media request encapsulates the challenges and peculiarities of PR at Twitter, the San Francisco-based micro-messaging social media company.

VP of communications Sean Garrett was steeped in serious work concerning Twitter's marketing strategy when he received a media inquiry all in caps.

"I get an urgent request from a large daily publication saying, 'I need ...