Is it still possible to become a 2010 zombie using the cardboard mask+shadowglen method? And is Facebook linking possible at this point in time?

You can't become a 2010 zombie because it's 2014 and it's not pandemic/survival anyway.

The facebook question, I don't know. [edit] Looks like there's something wrong with Facebook Linking at the moment and the programmers have removed it while it's being fixed. Source: http://subeta.net/forums.php/read/798534/-Cannot-Connect-to-Facebook

Okay thanks. I still wish I could do the zombie thing for the achievement though