by: Mathew Ingram | GigaOM.com

It’s no secret that mobile advertising is the holy grail that virtually every major digital player is trying to find, but no one seems to have cracked the code just yet. Facebook has admitted that while it has almost half a billion users on mobile devices, it still isn’t sure whether its mobile business is working or not, and Google hasn’t blown anyone away with its results so far either. According to some reports, however, one company that is having some success is Twitter — which now sees a majority of its advertising revenue coming from mobile. Is there something about Twitter that makes it more likely to succeed at mobile advertising than its larger competitors?