As someone who had access to M, initially my friends and I mostly just asked it to do all kinds of obscure things, which at scale would be very difficult (and I imagine most users would enjoy actually using it for as well for the sake of entertainment).

We asked that it drew pictures of us, and tons of other queries around memes, ect.

Outside of that the only other use case was having it remind me to wish friends a happy birthday when they otherwise didn't list it on facebook.