<p>The Winklevoss twins lost the biggest social-network showdown ever when their rival, Mark Zuckerberg, walked away with Facebook. Now they are trying againwith a social network for professional investors.</p><p>Flush with at least $65 million from the settlement of a legal battle with Mr. Zuckerberg and Facebook Inc., Tyler and Cameron Winklevoss are backing fellow Harvard alumnus Divya Narendra, their ally in the Facebook fight, in the investment website. The Winklevosses have put $1 million into SumZero, which was founded by Mr. Narendra and another Harvard alum Aalap Mahadevia, in 2008.</p><p>"The band is back together," Tyler Winklevoss said over ...</p><p><a href="http://online.wsj.com/article/SB10000872396390444433504577651750662070974.html">Keep reading...</a></p><p>Read also:</p><p><a href="http://ca.reuters.com/article/technologyNews/idCABRE88F0IH20120916">Winklevoss twins invest in social network company: report</a> (Reuters Canada)</p><p>Explore: <a href="http://news.google.com/news/more?pz=1&ned=us&ncl=dLdpzjeayQBb4cMFLUrsH_nMPZwlM">12 additional articles.</a></p>