Basically, TweetDeck is an app for Twitter that helps you manage your tweets. You can also run searches on Twitter, via TweetDeck and get pop-up updates if your search terms appear in Twitter. (These pop-ups are slightly annoying, but if you are Twitter-obsessed, perhaps you love their cheerful appearance.) Anyway, once you are signed in to TweetDeck or have downloaded it onto your desktop or iPhone, you can stay updated on your Twitter feed and get refreshed searches.
Twitter, you are determined to try anything.)
I would recommend running a Boolean AND, of the keyword for the profession you are looking for AND jobs, so you don't get the librarian saved my life tweets, or something about weird fantasies from people hanging out in the reference section (amazing what glasses and some smarts do to some people's libidos).
Now let's see if running searches on Twitter can actually lead to a real person, who will post a real comment that they found a real job--not just a posting or an interview, the full meal deal--through Twitter. I would prefer to hear from librarians and their successes, but I'll take anyone who can prove that Twitter got them employed.