Used

Have you ever been used before? You know what I'm talking about: when someone acts nice (sometimes) towards you, but they think that, in exchange for their "kindness," you should do whatever they ask and get them things. I'm especially a sucker for this, as I've been told I'm really nice, usually to the point of being conned into doing stuff. I've been doing a bit of thinking, and I've found a few "friends" that are, for the lack of a better word, users.
So here we are, a few steps one can take to dispel said moochers. However, I'm NOT saying you shouldn't be generous to others or thoughtful, but these tips are strictly for stopping usage of one's self.
1-If they try to use something of yours, and you know they won't return it by past experience, work out a system that requires them to return it, almost like a video rental store.
2-If someone comes over to your house/apartment to "hang out," yet they only use something of yours and pretty much ignore you, they're moochers. Sometimes you'll just have to tell them outright that you're not just a piece of meat with cool stuff.
3-They may have some kind of "sob story," and because of it, may try to get pity service from it. However, if you have a friend who is sincerely suffering, help them in any way possible. But sometimes people use totally bogus excuses, or they overplay the severeness of their problem. Just use your good judgment, and, if needs be, tell them to knock it off. Sometimes that's what it takes for their mooching behavior to stop.
Everything I've said above is for dealing with moochers and users ONLY. Don't be a scrooge, but instead a generous and giving person. Just be careful.