The twitter account DJIA50 sends a tweet when the Dow Jones Industrial average has moved 50 points since the day's opening or the last tweet. A few notes:
It uses data from Yahoo Finance, which is 20 minutes late.
The difference since the last reported value is only checked once an hour, because my host provider's terms of service won't let me schedule a cron job more often.
Bob DuCharme
October 15, 2008