Twitter is just another publishing platform. How you use it and what you publish is up to you. For example, lot of bloggers tend to update twitter when they make a new blog post. If you want to use twitter specifically to promote DhammaWiki, I would suggest you update twitter when new or interesting content is added to DhammaWiki.
I rarely post anything these days, but here's mine anyways:http://twitter.com/potomoto
"Of all tyrannies, a tyranny exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience." -- C. S. Lewis