Why does my iphone facebook app keeps logging me online?

I havn't been on facebook or read any messages on my phone for a day but my friends keep saying I kept coming online every so often, even at like 3 in the morning. Now it says last login was 43 mins ago my friend said but I havn't even used my phone. Why is this?

Your account may have been compromised. I would suggest you to change your facebook password immediately.
Be careful, and good luck.

Did you Close the App And Not Log Out If So You Are Kept Online Your Iphone Does Not Sign you Off of Facebook Unless you Hit Log Out if you Did And If it Still Saying your Online than your Account May Have Been Hacked Change your Password

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