Went onto http://sandiego.craigslist.org/act/ and found someone looking for things to do:
http://sandiego.craigslist.org/act/177911420.html

I then posted to:
http://sandiego.craigslist.org/com/178437291.html

and then, I added a link to sf0.org on http://en.wikipedia.org/wiki/Urban_gaming#External_links

I'm thinking that maybe I could post fliers around town that say "SF0 has intentionally left this posting blank", or something like that. Would that count towards the blank flyer task as the only information on there requires some research to discover the meaning of. Maybe it would keep more in the spirit if the flyer were left blank but posted with an SF0 sticker.