Refers to an individual(s) who displays themselves as a "hippy" via social networking sites, but upon being seen and conversed with in person, have no outstanding qualities that would allow them to be seen as aforementioned "hippy". Twitter biographies often include descriptors declaring that one is indeed "a hippy", "flower child", "peace lover", "acid lover", etc. May even go as far as to tweet and retweet things that encourage this false image, even though they may not fully understand the subject matter of said tweets.
John: "Sarah is a very judgmental, mean girl."
David: "But her twitter makes her seem so peaceful and cool, she's got a picture of the Buddha on her header!"
John: "Nah, she's just a twitter hippy."