Branchable

 Branchable  is a content hosting site that hosts wikis (ikiwiki) and blogs. They have an ownyourdata-friendly about statement:

"Everyone should own and control their data. So when you make a web site on Branchable, we don't lock you in. You can use git to download the entire source code of your web site at any time, and move it elsewhere if you desire. -- http://www.branchable.com/about/freedom/"

All their code is agpl open source and they let you use your own domain.