Facebook's interests are served by trading favors. FB has money and branding - that's its currency in Washington. And in Washington, legislators have complex ag

Facebook's interests are served by trading favors. FB has money and branding - that's its currency in Washington. And in Washington, legislators have complex agendas and constantly trade favors. So in order to get some legislator's support for the immigration reform they want, they offer to support something they don't care about normally (in this case, the Keystone pipeline). If you only think about your own interests in a narrow sense, you will be continually steamrollered by those with broader minds and agendas.