(1) to communicate to others that the particular tweet is valuable, by sending something with more scarcity than a mouseclick. (2) to help fund the creator of t

(1) to communicate to others that the particular tweet is valuable, by sending something with more scarcity than a mouseclick. (2) to help fund the creator of the tweet. (3) "is there really enough value packed into a tweet that I'd want to send someone money for it"? Well a tweet can be much more concise than a youtube video.