[kenkam]

The design is fantastic and I think you might be on to something here. Although there's the obvious problem (as seen from the comments) of users not being able to see what they endorse first, you will find ways to mitigate this.

Perhaps you let users tweet in the next X minutes of viewing; if they don't like it, they close the tab and there's no tweet.

In any case, good luck, and I look forward to seeing this work for you!