Ask HN: Ideas on how to improve upon TweetAStranger.com

Hey guys, I recently launched my first app, http://tweetastranger.com, which lets you tweet strangers that are also using the site.

I wanted to get your feedback on what additions could be made to the app, to make itself more viral. Or any other suggestions on what to improve upon. I think the potential is there, being that's it's very easy to use and interesting, but I'm not sure where to go from here.

Thanks a ton.