social: I'm assuming you got that part.

democratic: level playing field. ie, "one vote per person" - you have as much influence as you have, nobody's granted a super-tweeter account that can @ everyone at once simply by being, say, Bill Gates. It's a stretch, but I've seen it used this way before for Internet things.

empowerment of people to socially engage & communicate is the basis on which all democracy is built. That is what is beautiful about Twitter.

Shutting down competition or dissension is decidedly undemocratic.