According to Facebook, your cover photo is displayed at different sizes on desktops and on smartphones — 820 pixels wide by 312 pixels tall on desktops and 640 pixels wide by 360 pixels tall on smartphones. If you want to use a single image that works pretty well on both desktop and mobile, I found that 820 pixels wide by 462 pixels tall seems to be the best.
Years ago, I used to blog a lot about SEO and link building, and I won some cool awards for my blogging. These days, I tend to keep more to myself than to write my thoughts and theories for the world. Though I may not write much for the public these days, I’m still reading all of the news and theories of others in this industry on a daily basis. I still live, sleep, and breathe SEO. Plus, we have Ann Smarty on our team, who blogs and writes enough across the Web to compensate for my not writing. 😊
We’ve all heard those horror stories about folks who accidentally published personal content to their employers’ social media channels -- a marketer’s worst nightmare. So to avoid publishing mishaps like those, assign Facebook Business Page roles only to the employees who absolutely need it for the work they do each day. And before you do that, be sure to provide adequate training to those who are new to social media management, so they aren't confused about when they should be hitting "publish," what they should be posting, if something should be scheduled first, and who they should be posting it as.