You should try doing what we did when Publictivity first started. Find a potential customer or two, in this case it would also be a PR and/or marketing firm. Proposition them to pitch in $5000-$10000 each. Give them:

a) the software free for life b) a small stake in the company c) direct line access to new features + beta testing

Also:

a) Put a pitchdeck online that you're comfortable with b) Put some sort of small FAQ so douchebags like @gz can't really say anything.

Lastly, you should apply to YC for the upcoming session :-).