A major update on KakaoTalk, a mobile messenger operated by Kakao Corp., has sparked growing complaints from users, with its Instagram-like feed and increased advertisements drawing the most criticism. Friends' profile update history and posts were also reorganized into a timeline format. "The Friends tab is filled with updates from acquaintances and even business contacts," said Lee Eun-hee, 46, who recently updated KakaoTalk. Industry insiders expect Kakao to announce further improvements to the new grid-style Friends tab later this week. "Updated plans for the Friends tab could be shared soon."