ATLANTA, Aug. 24, 2011—Understanding that developing a trusted online relationship is the crucial first step in building customer loyalty and nurturing prospects, Silverpop™ today announced the launch of Social Sign-In, making this option available via email marketing and marketing automation platforms for the first time. Social Sign-In gives site visitors the opportunity to leverage their social identities during the sign-in process. An important option, since despite their desire to obtain helpful....