What is @earlybird?
Twitter @earlybird Exclusive Offers are special time-bound deals, sneak-peeks, and events that are promoted by the official Twitter @earlybird account. We partner with select advertisers and retweet offers that they have crafted only for the Twitter community. Our advertising partners determine the terms of the offer, including availability, amount, and price. As with other forms of advertising from Twitter, we are focused on bringing value to our users and will keep your interests in mind as we develop this program.
(Read more here.)
Twitter makes money from this through a revenue share with the selected advertisers. It all sounds a bit like @Woot, to be honest, and if the partners and offers are good and relevant enough could do very well indeed. (Woot, of course, was recently acquired by Amazon.)
No offers at the time of writing, but expect this to change very soon. Follow @earlybird now to be first in line for those golden eggs.