try to pluck out simple urls in basic tlds and treat their length as
a t.co url if it's longer than the url being shortened
of course this will not catch all urls, but i'm not going to load a
whole suffix list or library just to deal with this stupid shit
This drops storing twitter:last_story_id in Keystore and stores each
story's tweet id, so we can query which stories meet the threshold
and haven't been posted to twitter yet.