Instead of retweeting twitter mentions during conferences, I've decided to catalog, for my own benefit more than anything, Twitter feedback on my speeches. The first thing I do after I get off stage is talk to people, answer questions, share ideas, etc. The second thing is check Twitter. Twitter gives me almost instant feedback on how the crowd reacted to my content, delivery, personality, etc. It helps me refine my content and delivery for future events and often sparks off interesting conversations and debate.