This is the very social engineering angle that such a request plays upon, as once you accept the request, you will be engaged in a discussion with a chatbot.
Chatbots have been around for ages and I have many fond memories of random IRC users stumbling on a channel I used to hang out in, and attempting to strike up a conversation with our custom Eggdrop chatbot, as we had chosen a feminine name for it.
I recently had a strange contact request show up on Skype.
I mainly use this messaging platform for work, and I was puzzled, as I did not recognize the name of the requester.
It had accumulated a large custom vocabulary and you could have a decent, if somewhat erratic, conversation with it. virtual assistants, and contests in which bot writers try to get their respective creations to pass the Turing test.