Like civil-rights protesters who sang rousing hymns as they were carried off to jail, Twitterers are bearing witness to what's happening around them, and calling out into the darkness of cyberspace for confirmation. I'm here. You're here, too. We are present.
Presence is not some exotic state that we need to search for or manufacture. In the simplest terms, it is the felt sense of wakefulness, openness, and tenderness that arises when we are fully here and now with our experience.