Things aren't nearly settled yet in Egypt, but Internet access has been restored after a five-day outage imposed by the local government.
This morning, access slowly came back. Oddly enough, Noor, the final ISP to shut down, was also late in restoring service.
This means that access to Facebook and Twitter are back, which means that those who wish to tweet can do so the "old fashioned way" and use the Internet instead of the telephone.
Source: Renesys