I don't follow. Would you say that tumblr has very little original content? That's basically similar to what this service is, only it also automatically tweets a link to your rich tweet for you.
example: http://richtweets.com/2ri9c
In general, Adsense on a very generic site like this isn't that effective anyway. Ads aren't very targeted and Google also doesn't like that. They don't want advertisers to have a poor experience.