Because unlike Facebook which allows free speech (some, at least) and is therefore somehow responsible for iolence again women (through some alchemy that is quite beyond my understanding) Obama has committed actually violence against women (and children, and those two legged vermin, men) and therefore deserves t be impeached, as (at least on organization) of Veterans for Peace have concluded: http://www.counterpunch.org/2011/09/13/vets-for-peace-votes-to-impeach-obama-for-war-crimes/. Show your opposition to violence against women (and other living creatures) by supporting impeachment for war criminals!