Google search shows a collection of golf-related tweets with #instagolf. None of the tweets are related except that they are all about golf. So I'm thinking that someone was being "clever" and went for a portmanteau: instagram + golf
I've never encountered that.
I agree. It could be a driver from this years models might not be much better than what a golfer has.
Hitting up does produce the best results for driver distance.
Hitting up doesn't necessarily mean you hit the ball to high. I think most golfers think they hit the ball to high when they don't.