If you have JavaScript enabled, but you’re still having this issue, it’s possible that your software is blocking sites that you need to be able to access in order to use Facebook. We recommend entering http://fbcdn.net/ and http://recaptcha.net into the list of safe websites in your antivirus program or web browser.
Learn how to add URLs to your browser’s list of safe sites on Chrome and Internet Explorer.
Note: Firefox may not support the ability to add URLs to a list of safe sites.