The "u" in non-american english

[Final-Fan]

The Fury said:
I'm agreeing with you, the word 'their' is a possession usually used for a multiple persons case but in the case marked wrong, it's used unknown gender which is also correct. Their has 2 main uses, one for a possession for multiple persons, the other for a possession of unknown gender.

Of course, I'd say "Someone's lost their purse." But that's beside the point.

Unless you go with a strictly descriptive criterion (i.e. whatever gets popular enough is, like, correct), I'm pretty sure using "their" to refer to a single person of unknown gender is wrong.  

[edit:  Damn.  http://searchwarp.com/swa129788.htm
["In fact, the “singular their" construction goes back about 700 years and managed to co-exist with the “neuter masculine" construction for most of that time. Nobody seemed to be much concerned until late in the 1700’s or early 1800’s. That’s when the “prescriptive" grammarians began to attack in earnest because “singular their" didn’t fit with the “logic" of the Latin grammar they were forcing English into. So, it became bad grammar in the same arbitrary way that splitting infinitives and putting a preposition at the end of a phrase did."

(The "neuter masculine" means using "he" when gender is undetermined -- which has become un-PC.)]