Some people are seeing this error in Internet Explorer 7. Here's how you can fix this:
Open Internet Explorer
Go to Tools > Internet Options
Click the Security tab and choose Trusted Sites
In the Trusted Sites section add:
"https://*.facebook.com"
"http://*.facebook.com"
Uncheck the box next to Require server verification (https:) for all sites in this zone
Click Okay to save your changes
If this doesn't resolve your issues, please let us know.