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In simple terms: don't be perverse, rude, or vulgar. Any girl with an iota of self-respect won't tolerate that sort of behavior. Play the part of the polite gentleman if you want her to respond to you in a positive manner. Don't treat the girl like an object, curse at her when she doesn't respond the way you'd like her to respond, or turn the conversation to sex before any mutual attraction and romantic interest has been established. Being respectful encompasses more than just these three points, but minding these basic manners will at least be a good start. You can open the conversation with a joke to break the ice, but the wrong joke can start the conversation on an excruciatingly bad note. Humor doesn't always shine through when you're communicating digitally, so it's usually best to save it for when she gets a better understanding of your personality and sense of humor. If you do decide to open with a joke, stick with something safe. An obviously cheesy joke can work out well, and mildly self-deprecating humor might make her chuckle, too. Avoid off-color humor or jokes that can be easily misinterpreted, though. Opening a conversation by talking about your good points will only make you look egotistical. As the conversation progresses, the girl will likely ask you questions about yourself, and that's when you should start opening up about the details of your own life. On a similar note, don't talk and behave as though you're "God's gift to women." Even if you're the most charming guy alive, no woman is obligated to develop an interest in you. Try your best, but don't blame or insult the girl if it doesn't work out. Even if you're hoping to pursue some sort of relationship with this girl, you shouldn't start the conversation by asking her out. In fact, you should probably wait until you've gotten to know her over the course of several conversations before moving to that stage. As a general rule, you should wait until some mutual level of chemistry has been established. If and when you ask her out, do so as casually as possible. You don't even have to call it a "date"saying that you'd like to meet up and hang out in person is usually the best way to go. Don't ask her about other guys when you send her that first message. If you obsess too much about the other guys talking to her and appearing in her photos, you'll probably scare her off. Only ask her about the other guys in her life if you can do so naturally and as part of another topic. For instance, you could ask her about how she knows a mutual friend who happens to be male or ask her about the mixed group of friends she went to a concert with. The key here is to keep the conversation about her and her experiences while making the identity of the guy a secondary concern.
Demonstrate respect. Use humor cautiously. Avoid bragging. Practice patience. Abandon any jealousy.