It's amateurish though. If it isn't apparent to you why, you're playing at a different level than people who understand why it's amateurish. I'm not going to go point for point with people about this - it's okay for us to disagree. But if you're not capable of puzzling this out on your own as to why it's potentially disruptive than you're not ready for certain types of matches, specifically matches where this sort of behavior is not allowed. Making rules isn't about stipulating 900

about different things like:
-thou shalt not post press screenshots
-thou shalt not mail people photographs of screenshots
-thou shalt not post videos of photographs of screenshots
By the time that you establish five to ten rules the rest of them should be common sense. While this is not an adult game, it is played by adults and so young people should try to understand that we don't have time to babysit you.
I recognize that a lot of the people reading this thread are a bit younger and I think the disconnect is that you guys think that this sort of behavior is new and innovative. It's not. Trust me. People have thought of this before. You're not the screen-shot posting ninja that you think you are. If you have to resort to this sort of behavior to win then you're not better than a multi-player. If you're putting this sort of option on the table, then mutli-playing is on the table as well.
There are different levels of diplomacy play as well as different styles. In England, for example it's pretty common place to try to get people drunk during half-time at live matches. In the US this is discouraged.
I would argue that at it's purest form, cheap shots detract from game play, rather than add to it, unless what you're attempting is truly truly innovative. The problem is though that this game has been around for decades and so you're probably not as innovative as you think you are.
It's kind of like the kid that pulls the fire alarm at a science fiction convention. Yes they think they are pimp and hilarious and smooth, even though everyone much older thinks they are stupid. I remember being fifteen and thinking this is hilarious. But it's only hilarious the first couple of times that you see this. Someone tries this every year. When you're in your twenties, etc., it just becomes one more nuisance. Remember that you're not the screen-shot ninja that you think you are.