Why do people not mind their own business?

[Shaun]

"What are you doing?"
"What do you think you're doing?"
"Where are you going?"

These are questions I REALLY hate. Pointless, anxiety-sparking, nuisance questions. Why do people not mind their own business??? I don't mind people asking me some of those questions if they are relatives, are with me etc, but if they are a random stranger then no
@John funny but true XD

[john]

I know, Facebook wants to know "what's on your mind"? Twitter used to ask "what are you doing" now they ask "what's happening" and Google directions seems to always ask "where are you going"?

[Powerhouse]

They're just trying to be friendly. Just give them a vague answer and make an excuse to leave.