In their second wave of filing in two weeks, Uniloc USA, Inc. and Uniloc Luxembourg S.A. (Uniloc) added Facebook (6:16-cv-00223), Viber Media S.à.r.l. (6:16-cv-00224), and WhatsApp (6:16-cv-00225) to Uniloc’s unified communications campaign. As in Uniloc’s suits filed on March 4 against Atos (Unify) (6:16-cv-00101) and NEC (6:16-cv-00100), this week’s filings accuse the defendants of infringing a single patent (8,571,194) from a family of five generally related to initiating a conference call in an instant messaging session. Uniloc’s infringement allegations focus on the companies’ software that implements messaging/voice call technology.