Google app and Safari app on iPhone?

I have an iPhone 6 and I use the Google app to search everything I need on the Internet. I never use the safari app but sometimes things pop up on my safari as if I've searched them. For example, the Facebook login page pops up sometimes without me knowing and I have disconnected my Facebook a long time ago. Other login pages Pop up sometimes as well. Does this happen to other people?

Maybe someone is getting on your phone or your accidently clicking links to facebook?