On Saturday, Robert Bowers allegedly opened fire in a Pittsburgh synagogue Saturday killing 10 and injuring a dozen.<br />Police are still piecing together Bowers life.<br />He was reportedly a frequent poster on Gab, a relatively new social network that has attracted many from the far-right fringe.<br />Business Insider reports Bowers reportedly joined Gab at the beginning of this year.<br />He used it to post a series of anti-Semitic messages and redistribute many more from other users. <br />
