Your thoughts would still be your thoughts. I would want such a tool to make sense of the hive mind. If I through this thought at my followers, what might come back? Now that tool could be tuned to go wild or be more conservative and I might agree with some of it or not but it should be inspiring in many instances. And as for the writing help, I'd keep it to grammar and spelling. It would help me get more creative with words as I often feel insecure on how to use lesser used expressions and swap them for simpler language to not say something stupid. With such an assistant I could experiment more. It surely could also help with mention suggestions or timing posts but I would not want it to guess my own writing.