<p>Pittsburgh police said they had serious concerns when an armed man took a business owner hostage in a downtown high-rise office building and not just because he had a knife.</p><p>The suspect, 22-year-old Klein Michael Thaxton, made Facebook posts during the five-hour ordeal Friday, authorities said, and they feared that responses from friends, family and others might goad him into violence.</p><p>In the end, police say, Thaxton surrendered peacefully and released businessman Charles Breitsman.</p><p>Now police believe that Thaxton might have chosen Breitsman because he spotted a smartphone and computer in his office and saw a high-profile opportunity to express himself on the social networking site, Chief Nathan Harper said.</p><p><a href="http://www.nbcnews.com/technology/technolog/facebook-posts-hostage-case-worry-police-1B6047330">Keep reading...</a></p><p>Read also:</p><p><a href="http://www.freep.com/article/20120922/NEWS07/120922023/Facebook-posts-worry-police-Pa-hostage-taking">Facebook posts worry police in Pa. hostage-taking</a> (Detroit Free Press)</p><p><a href="http://www.jacksonsun.com/viewart/20120922/NEWS/120922002/After-Facebook-posts-Pennsylvania-hostage-taker-surrenders-?odyssey=tab%7Ctopnews%7Ctext%7CFRONTPAGE">After Facebook posts, Pennsylvania hostage-taker surrenders</a> (Jackson Sun)</p><p><a href="http://www.pcworld.com/article/2010467/Facebook_still_a_haven_for_criminals.html">Facebook still a haven for criminals</a> (PCWorld)</p><p>Explore: <a href="http://news.google.com/news/more?pz=1&ned=us&ncl=dw-f04rTIEQ2SQMJBQSSI-DQ5T6yM">1,629 additional articles.</a></p>