securelist[.]com/blog/incidents/75237/facebook-malware-tag-me-if-you-can/
The most affected countries were Brazil, Poland, Peru, Colombia, Mexico, Ecuador, Greece, Portugal, Tunisia, Venezuela, Germany and, finally, Israel.
Most of the article discusses what it does & how, but towards the end it says the easy way to see if you're effected is:
The easiest way to check if you are infected is to open your Chrome browser and look for the extension named thnudoaitawxjvuGB. For a more thorough check, click Start > Run > copy the following command: %AppData%\Mozila if the folder and files such as “autoit.exe” and “ekl.au3” are in it, the computer is infected.