Several prominent liberal organizations are launching a boycott of Facebook, an escalation in the simmering feud over founder Mark Zuckerberg's immigration reform push.

Progressives are upset with the ads Zuckerberg's group FWD.us has funded in support of vulnerable senators who back immigration reform. Instead of defending the comprehensive reform effort, the spots try to give those lawmakers cover with conservatives by touting their support for oil drilling and the Keystone XL pipeline and opposition to Obamacare.