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After setting up your account, take your time and think of a 'one line' biography to attract the attention of recruiters. If you want to be found by such people, use key words and phrases relevant to your industry.
Not only this, but use Twitter as an extension of your resume. Keep it professional and concise -- the more relevant your Tweets to a target audience, the more likely you are to attract the attention of others who may have connections valuable to you.
If you're seeking a position in the IT industry, why not Tweet interesting news and articles, or offer an opinion or two? Tweeting about your breakfast will impress no-one, but some insight in the latest financial quarter results may.