Summarize this article:

Your friends may have heard whether the person likes you or not. Even if they haven't, they'll probably be better at guessing than you are. That's only because when it's you in the situation, you have a harder time stepping back and analyzing it, and you may feel a little self-conscious thinking about a girl liking you. Therefore, asking a good friend can help you analyze the situation better. One way to see if a girl likes you is to watch how she treats you on social media. Of course, you first need to friend her. Once you do, watch how she interacts with you. If she seems to pay extra attention to you, she may like you. For instance, maybe she "likes" everything you post or tags you in a number of her posts. For instance, if she writes "Cute!" on a selfie you posted, it may be she's flirting with you. If a girl likes you, she's going to find reasons to be near you. Even if you've never talked to her, you'll look up, and she'll be at the next table in the library or a few benches down at the basketball game. It's not that she's stalking you. Rather, she's probably hoping you'll notice her. This approach may include things like walking through your line of sight or talking to people near you. If you're trying to figure out if someone likes you by analyzing everything she does, she may not be that into you. If someone likes you, you'll generally know it in your gut, with the exception of very shy people. However, if you're not sure, it's always best to give it a shot by talking to her. The worst she can say is "No!" If you notice that she seems to go up and talk to everyone, but avoids talking to you, she may just be nervous about talking to you. In other words, she doesn't talk to you because she likes you, and that makes her scared. Another step you could take is to talk to one of her friends, particularly if you have a class with one of them. A simple, "Hey, you're Jess's friend, right? Can I ask you something? Do you think Jess likes me?" is really all you need. You can also watch how her friends react when you're around the whole group of them, including the girl you like. For instance, they may start whispering to each other, teasing the girl, or even pushing her in your direction.

Summary:
Ask your friends what they think. Watch for signs on social media. Notice how often she's around. Pay attention to what your instinct is telling you. Pay attention to when her shyness hits. Use her friends to your advantage.