Nonprofit software vendor Blackbaud has acquired Attentive.ly, a company that enables organizations to conduct social listening. Charleston, S.C.-based Blackbaud plans to more deeply integrate Attentive.ly's capabilities into the next generation version of Luminate Online, which is a marketing tool. Terms were not disclosed. Attentive.ly, based in Bethesda, Md., has been a strategic partner in Blackbaud's partner network.