Well, I'm marginally tech savy, but I've never poked around on friends/people's computers. Generally if they need help, I stick to addressing the problem (I don't even look at their favorites or history pages.) I guess maybe I could in the future, but probably not.
Not to sound prudish, but a word of...care to you guys:
Finding someone's stuff is one thing, I mean, you ARE poking around on their computer/phone/camera.
Sending it to yourself/copying it isn't necessarily a good thing (think about if someone did that to you. And for you gay guys, pretend it was a FEMALE friend of yours that was getting your pictures and pleasuring herself to them.) I mean, how would that feel to you? Some of you might find it a turn-on, but at the same time, whether the person is gay/straight/bi (of your sexuality or not or of the sex you're attracted to or not, OR a person you are not attracted to), would you REALLY want them seeing/pleasuring themselves with your pics (of course, if you WERE attracted to them, you probably wouldn't mind but would like to know they were doing it. ^_^) HOWEVER, I'm not going to say this is out and out bad. I mean, they aren't really getting hurt by it, you're getting off...it would be better if they knew about it though, cause you're going behind your friends' back when you do this.
...BUT, taking those pics and sharing them/posting them on the web is NOT cool. How would you feel if your pics started being spread around the net with neither out your concent, or EVEN you knowing?? I mean, it might be cool thinking people were getting off on your bod, but not knowing who? And what if you didn't even know? This is especially bad if the person's face is in the pic. I mean, most of you don't put even your faces on your profiles, much less shots of you nude or jacking.
All in all, my general view is, if you have pics of you, or a friend has given you pics and said it's alright to share them, then you can share them/put them up on the net. After all, they're your pics. (If they're your friends and they gave permission...I'd say wait a while and ask them a few weeks/months/years later, as it might just be a youthful thing or a horniness thing which the person would regret later.) In fact, you might also want to use that caution yourself. I'm young and sometimes horny, but I'm careful cause I know some things I might regret later. ^_^
BUT, pictures of other people you should never give out without permision. It's just a violation of trust and is VERY bad of you to do. But feel free to jerk off to them and keep them on your computer, though offhand I'd say you should let them know or give them pics of you too. Fair's fair, after all, right? ^_^