Could be ''Bot-Zero''. A real person who is originating all these other bot accounts but is able to use them and personally respond as and when he desires
I don't know how bots work really but yeah it does seem like they respond sometimes in a way that's too convincing to not have a real person behind it.
Maybe the bot has been online for so long now that it has evolved to become sentient? Maybe this will happen to all bots left unchecked. Perhaps this is the real rise of machines?