By Miyoung Kim and Andjarsari Paramaditha SEOUL/JAKARTA (Reuters) – South Koreas pioneering mobile messaging apps have taken their oversized emoticons to Indonesia, intent on breaking the dominance of BlackBerry Ltds BBM messaging service in one of the worlds most active social media markets. Kakao Corp has hired pop stars and Naver Corp unit Line Corp has partnered Samsung Electronics Co in a country whose capital Jakarta boasts the most users of Twitter Incs microblog by city, according to researcher McKinsey Company. BBM has long been Indonesias most popular messaging app, with Facebook Incs $19 billion buyout target WhatsApp in pursuit.