Often a picture of a building does not get approved by Facebook since unless the sign is visable, there is no association with the Church.
I personally feel that despite the name of the Church, that too few members of the public don't associate Christ with the Church and since these places/pictures are public, it does not hurt to support the concept. Many other church FB locations simply have a picture of a cross, we know that's not appropriate for us. Remember FB is approving these pictures very quickly. A picture of a building may not get a second glance but a recognizable picture of Christ will.
For the buildings I have been able to update near me, mainly in the DC area, I have been using the same picture, Christ in a white robe appearing in a cloud with arms stretched out.