Add yourself to the twiends directory if you'd like to grow your twitter following. It's completely free, and you can choose your country and interests.
A profile with a high twustworthy score is well setup, with a mature following. It has likely been around for a long time and is well-looked after by it's owner.
A profile with a low twustworthy score may be very new or not set up by it's owner yet. It may have a poor tweet history and may even contain matarial considered spammy in nature.
Twiends allows people to grow their online communities for twitter, facebook, youtube and their websites.