Facebook recently updated the guidelines for cover images on Pages to help remove doubts about whether you’re crossing the line or not.
In the updated Page guidelines, it reads:
All covers are public. This means that anyone who visits your Page will be able to see your cover. Covers can’t be deceptive, misleading, or infringe on anyone else’s copyright. You may not encourage people to upload your cover to their personal timelines.
Covers may not include:
i. images with more than 20% text;
ii. price or purchase information, such as “40% off” or “Download it on socialmusic.com”;
iii. contact information such as a website address, email, mailing address, or information that should go in your Page’s “About” section;
iv. references to Facebook features or actions, such as “Like” or “Share” or an arrow pointing from the cover photo to any of these features; or
v. calls to action, such as “Get it now” or “Tell your friends.”
Item i is the biggest change, stating the specific limit to the amount of space for text. Facebook has developed a way to scan images for text, but whether they’ll use this to police covers remains to be seen.