Positive or negative?

I saw this 'conversation' the other day.

Yet another example of how a machine can't think like a human does.

A few months back I did a lot of research on social media monitoring for a client.

I learnt that many of the best social tools were able to differentiate between negative and positive chatter.

Which is very clever.

But I guess buying weed in a car park doesn't fit into either of the negative or positive sentiment boxes.