I cloud, snap chat, and Instagram broken?

So last night I was going to bed and I did my usual routine. I check all my social media(which were logged into my accounts) and then I killed all the apps on my phone and went to bed. I woke up this morning and went on my phone and all my apps were not killed and apps were open that I didn't open before. When I opened the apps they were logged out of my accounts. Instagram was logged into one of my friends accounts who I never talk to and there's 0 way they could have even touched my phone. Snap chat was at the log in screen with her username in it, and find my iPhone was a the log in screen with her icloud typed in. I texted her and asked if she messed with her icloud or anything and she said no. This just doesn't make sense and I want to figure out why this happened so it doesn't happen to me.

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