Sure, but Twitter should be able to fairly reliably detect that someone like Marco isn't interested in the global trends, and serve him stuff more likely to be of interest.
What Twitter's currently doing is akin to Google text ads on HN for Justin Bieber-themed desktop wallpapers - it's completely untargeted.
What Twitter's currently doing is akin to Google text ads on HN for Justin Bieber-themed desktop wallpapers - it's completely untargeted.