Ron Goldman's sister is reacting to news that O.J. Simpson has joined Twitter, and she's horrified. “It is hard. He is living a very large life, he is revered in Las Vegas, and now to see the response he is getting on Twitter, it is hard,” Kim Goldman said Monday.  Two days after the 25th anniversary of Nicole Brown Simpson and Goldman's murders, O.J. Simpson officially joined the social network and posted his first tweet. In the video, Simpson is charismatic and smiling.

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