I'm 17, and a male.
Personally I would normally not ignore someone I have feelings for. Although there is this girl, we had a thing and even went to prom of 2009.
It started out as her friend suggesting to me that I should ask her to prom, I thought she was pretty cool at that time so I did. We went to the prom and we both enjoyed ourselves and were happy. That summer I didn't make any efforts to contact her, because I wanted to give her space and take things slow, and for the fear I was moving away.
After the summer ended, I didn't move away and we did end up hanging out a few times during the summer. She went to a school-sponsored camp that summer also. In december of 2009, I asked her out after talking to the same friend of hers (I know she had a thing for me at that time for sure), we went out and 2 days later she dumped me. About a month later I found out that another friend of hers had feelings for me and started to treat her very bitterly and she dumped me because of that. We kinda had an on-off type of relationship for the next few months, until late May came along, and she confessed to me that she had feelings for another guy she met at her camp, and had for a few months but apparently did not tell me due to not wanting her father to find out.
Of course I took this the wrong way at the time and was under the impression she used to me hide her secret, but it turns out her Father had thought I was a nice kid and was pressuring her into dating me (which I guess eventually turned her against me). Things were kind of the same between us the next few months after we explained stuff to each other better and more clearly.
After summer of this year, I've attempted several times to keep in touch with her, but she's started avoiding and ignoring me. Now it almost seems like she purposly flirts with other guys in front of me to try and make me jealous, so for the past month or so I've been starting to ignore her more and try to move on (I come from a rural area, not many girls to pick from :S). Since then she's started to try and flirt with me several times, but still ignores me on places such as Facebook and such. I sent her a message asking her if I did anything that turned her against me or such, and she said that I never did anything. She won't talk to me about why she's been acting like this or anything, so I just kind of gave up.
So yeah, ignoring someone in my opinion will get someone's attention, but also could hurt them in the process. I'd personally call it giving them space, but some people are just weird and won't explain anything. It may work for some people, but if they truly have feelings for you, I doubt they'd enjoy that too much.