Ask HN: Please rate my start-up idea

I'm making a twitter ad network that let's users find and choose interesting posts, links, etc from businesses who put them up on the site(Kind of like on hacker news).

The twitter user then browses, votes, etc. Then when they think that one is interesting enough, they promote it with a tweet. Worded however they choose to word it. All done in a non-spammy way.

I think that it may be whats missing in social advertising but i really am questioning the idea.

Some feedback from HN is greatly appreciated.

Cheers!!

Note: Excuse the poor writing. :)