Those wacky editors over at Yahoo! Style are at it again with their crazy-ass vocabulary and their grammatical blunders:
In their world, wanderlust isn’t an obsession or impulse to travel. It’s a synonym for wanderers or travelers (which, of course, it isn’t to the rest of us). Maybe. That’s the only explanation I can offer to the use of the pronoun their. It needs an antecedent (the thing it refers to) and it looks like the reader has to supply it, since the writer didn’t.