(Reuters) – Twitter Inc split the roles of recently departed chief operating officer, Ali Rowghani, at a time when the microblogging site is seeking to revive slowing user growth. Adam Bain is in charge of revenue and partnerships while Gabriel Stricker is responsible for marketing and media, according to their latest Twitter profiles. Rowghani, once seen as an influential No. 2 who oversaw Twitter's product development, finances and deal making, departed after clashing with Chief Executive Dick Costolo over whether he should continue to oversee product innovation. A second consecutive quarter of lackluster user growth by Twitter is testing the patience of investors.