Pinterest buys Kosei to target ads by Sharon Hill in Marketplace 22 Jan 2015 Pinterest continues to move toward marketplace, and revenue building of its own. Its most recent step in that direction is the acquisition of Kosei, a new Calif.-based recommendation engine. The Pinterest engineering blog explains: This article is only available to AIM Group clients. Please subscribe now or log in to view. Share KoseiPinterestSocial Sharon Hill Sharon Hill has been a senior writer / analyst with the AIM Group since 2004, except for a two-year time-out to serve as sales and marketing manager for Suburban Newspapers of America. She worked at newspapers in California, the Carolinas and Indiana as a classified advertising sales supervisor and manager, and in newspaper circulation in Alaska. At the SNA, she was responsible for bringing in new members; lining up exhibitors, and helping develop programs for the classified conference and the classified alliance. She is also co-author of “Implementing and Managing Telework: A Guide for those who make it Happen” (Praeger Press) and a prolific blogger and social media user. She is based in Phoenix.