[TAForObvReasons]

You cannot short any stock from most retirement funds

EDIT: for those downvoting, please point to a retirement vehicle that does support shorting

[mattferderer]

I didn't downvote but the closest I know you could do to this is buy an inverse ETF that is heavy in Facebook. I don't think there are any inverse ETFs that would even have more than 10% Facebook.

[amha]

True, but you can short the stock from elsewhere in your portfolio (i.e., just a standard nonretirement account), and it's economically equivalent (modulo some stuff with taxes).

[the_narrator]

Complaining multiple times about being downvoted tends to add to more downvotes.