I think its is appalling that airbnb is doing nothing more than asking hosts to give homes or rooms to those displaced by the fires, yet, the only thing they have done is set up a link (that I cannot find) to arrange those hookups. Many of the victims aren't able to go online for many reasons.
My suggestion to Airbnb is to have just some of the 1000+ employees in San Francisco make the short drive to Napa, Sonoma and Santa Rosa, set up a stand where fire victims can be hooked up with hosts willing to give their rooms to these people. In addition, Airbnb could help hosts by paying a nominal part, maybe $20 to help the hosts cover part of the costs of hosting someone. It seems a small price for Airbnb to get something more than token PR about how they are all about Sharing, Belonging, Hosting.