A woman checks the Facebook Inc. site on her smartphone whilst standing against an illuminated wall bearing the Facebook Inc. logo in this arranged photograph in London, U.K., on Wednesday, Dec. 23, 2015. Facebook Inc.s WhatsApp messaging service, with more than 100 million local users, is the most-used app in Brazil, according to an Ibope poll published on Dec. 15. Photographer: Chris Ratcliffe/Bloomberg
Facebook did not disclose terms of its acquisition of Kustomer. Bloomberg  

Facebook acquires New York-based customer service software maker