Ashley Tisdale's obsessed allegedly fan violated a restraining order against him by contacting her via social media and was arrested Friday, TMZ reported.Tisdale, 27, was granted a temporary restraining order against Nicholas Fiore in May, when she claimed she feared for her life after Fiore threatened to shoot her and her boyfriend, Christopher French, musician in Annie Automatic. Fiore also sent Tisdale more than 18,000 tweets since 2012.Fiore sent tweets in the past writing messages as though the two had a relationship.