This is also a great app to find new users for any particular site that already fulfils a request. Thus, there could be a field where people can write the name

This is also a great app to find new users for any particular site that already fulfils a request. Thus, there could be a field where people can write the name of an applicable pre-existing app with a note, with that also being tweeted out to the requesting user. Then, bunch all the notes and source tweets that apply to the same pre-existing app together. Ideally, you could also group similar requests together for developers to approach jointly to raise funds using a note they place below, that also sends a tweet out once inserted, or, these people can be informed of a suitable app once launched. So, you'd be building a directory (eg http://twittown.com/ http://twittown.com/) of existing and proposed apps, tied to the tweets you've recovered, each with user responses as submitted on the site.