What is the purpose? If you do it on twitter you lose lot's of stuff that makes stackoverflow good: reputation, voting, a competent userbase etc. What you want

What is the purpose? If you do it on twitter you lose lot's of stuff that makes stackoverflow good: reputation, voting, a competent userbase etc. What you want probably is a notification when someone anwers a question. If email isnt' fast enough build your own notification system using their API