Heck

Companies do not experience one day of revenue loss and pull the plug, destroying years of work and firing dozens if not hundreds of employees.

Companies which experience loss in revenue and consumer interest make investments and changes in order to regain their users/customers. That’s why organized protests and boycotts WORK. Tumblr will NOT go down after one bad day or week, but they might be willing to listen to its userbase if we put up an organized protest. (If you don’t believe me, think about how long sites like MySpace and Google+ hang around with fractions of their previous user base, often for years.)

Yahoo paid over one billion dollars for Tumblr, and the website will not go offline because of a one-day event, so in conclusion,

DO log off on December 17th to show Tumblr that you disapprove of its recent content ban and clumsy execution of censorship.