facebook has blocked me and tells me to run anti-virus software

Today I was updating one of my Facebook pages for business and I got an error message. I had uploaded a new cover photo to my FB page and was attempting to edit the info about the photo, along with a link to my website, using Google URL shortener. The FB message popped up because what I had typed "looked spammy". I was immediately logged out of FB and when I attempt to log back in, I get this message:

Your computer has been infected with a virus or with malware. You should run anti-virus software to remove these harmful programs and keep your information secure.

• For Microsoft: click here
• For Apple: click here

I've run a software update on my Mac and restarted it. Still cannot log back in to FB. Any other ideas out there?

UPDATE: I clicked the box that certifies that I have run anti-virus software (even though I haven't) and was able to log in. Seems that problem is solved, for now.