Sadly, I have been researching this arena more than 4 years actively. Since we are in Turkey and we need strong support Turkish, none of these vendors support Turkish classifcation, taxonomy, entities etc..Using Social Media APIs from several vendors and coming up data analysis are not problem at all, the real value for marketers or brand managers is end-end platform in Turkish.
Even yesterday , I have had webex with one of the raising Text-analysis company in US and Europe who claims having Turkish support. However after n hour, you realize that it is just Turkish encoding support, which is nice too but again End to End support !:). I personally really like visible Technologies very much and always says” I wish it could support Turkish” 🙂 you can download new Forrester Report from the link.