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annej - 5:33 pm on Nov 28, 2008 (gmt 0)
It probably depends on what your sites are about and the results won't be major. You have to be willing to chit chat a bit. Just putting up ads won't work, people either won't follow you or they'll drop you when they discover you are just in it to advertise.
There are tons of normal people on Twitter. I follow people in my hobby topic. It lets hobbyists know about my sites and I've made some nice connections and some good write ups and links have followed. It's kind of fun and doesn't take much time.