Where would I put an in society wide in character message?

[captnchuck67]

If my character wanted to do so?

[Muser]

Somewhere close to Grand Lodge "Wands-r-Us 7/11".

[Woran]

Put up flyers in the breakfast hall?

[Jayson MF Kip]

Petition to be the keynote speaker at the next Grand Convocation?

[Zach Davis]

Give the message to Zarta and tell her to share it only with her current lovers.... though some non pathfinders may get the message as well.

[Tabletop Giant]

Graffiti Torch's bathtub. That thing gets a lot of visibility!