I have one awkward question for you :

- why do you choose to work on certain pieces of functionality and not others?

1. Build something like graphite/carbon to provide metrics and display them easily. Start with the ones you mention - audience numbers and growth.

2. Talk to the co founders - start with a letter that you simply hand over the table in the pub. In it explain pretty much the above comment, maybe without the only adult comments

3. As someone else mentioned, set some goals and prepare to walk.

4. Consider your exit strategy - how much runway do you have personally? Want to get FTE or contract?

Basically try to mend it - but give yourself a fixed time horizon of no more than three months