A: It already is:
While we can’t pinpoint an exact number, Twitter has probably around 18-25 million users worldwide. Heck, let’s say there are 30 million to be generous. Gmail has over 38 million uniques in the U.S., and that was back in September 2009. Worldwide, that number is simply larger.
Yes, there are far more tweets than comments/posts on Buzz right now, but beating those engagement numbers isn’t out of the question for Buzz.
Q: Could advertisers and brands switch some of their dollars and focus from Facebook and Twitter to Buzz?
A: With millions of people using Buzz, how could they not?
Buzz is already taking a chunk out of Twitter, Facebook, and other social media services. That’ll only grow as brands and advertisers better understand what they can do with Buzz and its millions of users. Buzz is equivalent to throwing a giant super magnet into a room filled with nails.