You tube

The only videos I was interested in seeing were dressage videos (of course). After I'd watched a bunch of them, I honestly couldn't think of anything else I was even remotely curious to see. I'm sure this is very useful for people buying or selling things (e.g. a house or a horse), as this gives you the opportunity to see the thing you want to buy without having to actually get out of your chair. It's not anything that I think I'd actually use for any other purpose, buy, hey, people love it.