my girlfriend liked a dating site on facebook?

[jamie]

so i was scrolling through facebook on my phone today and noticed that my girlfriend liked a dating site called zoosk which was posted in today's news feed. is this a sign she's using a dating site since signing up for things on your phone usually also likes it on your facebook? or is there another possible explanation?

in additinon to any advice i'm just gonna make a fake account to see if i can find her on there. constructive comments only please
i know she's also got a profile on okcupid which i also did though i changed my status when we got together. it says she hasn't logged onto it since around the time we started dating. we've also talked about us a few times and she said she's always afraid of losing me so am i being to paranoid and letting my trust issues get the better of me?