Hello, Twitter rolled out its advertising, boosting tweets etc.. (ads.twitter.com) First of all my question is: What are the rates? I was checking out there, but it doesn't show anything clear.. For example Facebook post boost show that it'll reach this number of audience, but Twitter its not showing for what budget it'll show to how many people.. Let say for $20, how many people will see a tweet? Any idea? Question no 2: Does it really worth it? using twitter to do advertising?