You can now install GetTheAudience companion, an extension for Chrome or Firefox that automatically bookmarks whom you visit on Twitter and on which tweets you click to read them.
Every tweet and every person that you click on Twitter will automatically be bookmarked in GetTheAudience. This allows you to discover your audience while not actively searching for them.
I wrote the extension for Firefox, first, and ported it to Chrome using a polyfill for the standardized browser add-on API that Firefox already has.