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Facebook Cover Photo Policy

The guidelines say that your Cover Photo can’t contain any of the below

• Price or purchase info such as “40% off” or “Download it at our website”

• Contact information, such as web address, email, mailing address or other information intended for your Page’s About section

• References to user interface elements, such as Like or Share, or any other Facebook site features

• Calls to action, such as “Get it now” or “Tell your friends”
Meghan Riley's profile photoSarah Lee's profile photo
I see a lot of pages not following this. Mostly small timers.