What happens if I click on a suspicious ad not by the website, and how can I get rid of it?

[delightfulcoil043]

Those ads are being inserted by a type of malware called Adware, you should go through your browser extensions and toolbars and remove the ones you dont trust, if that doesnt fix it, run an antimalware scanner such as Malwarebytes Antimalware or Superantispyware, and that should get rid of it.

Once youve got rid of the adware,a great way to remove facebook's own annoying and intrusive ads is to install the highly rated and free FB Purity browser extension, it lets you filter out the junk you dont want to see on Facebook:

Source(s): http://fbpurity.com