(Photo: Getty Images)With Twitter, you can have a direct line of communication with anyone, a feature that is both one of the coolest and creepiest aspects of the social networking tool — cool for obvious reasons and creepy because there's no background check to open a Twitter account. Ashley Tisdale knows this from personal experience.The High School Musical actress has been on the receiving of a digital stalker who's sent her more than 18,000 tweets, and now the police are looking into the...
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