Depending on which Sarah Trueman you are talking about, there are probably a lot of results that you will get due to the number of different people with that name. If you log onto facebook and look at the top where a search bar is located, you can type in her name and it should bring up results of everyone with that name and a facebook profile.
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Selena Gomez doesn't make a facebook account
you can find it on facebook pages or on tumblr.
There are no possible ways to find out.
She only have a facebook page. She said it during an interview with Will Poulter and she also wrote it in answer to a fansite who sent her a Christmas Book. Some of her Narnia co-stars doesn't have Facebook or Twitter.