A lot of twine folks with wordpress blogs upload their html file to dropbox, and then just link to that from wordpress. e.g. 'You' and 'Onesie' linked from here:
http://zoyastreet.com/my-games/
This works for me because my games are pretty basic and uninteresting to most people, so the bandwidth cap on Dropbox isn't an issue. If you're expecting a great deal of traffic to your game, you will probably have to transition your blog to self-hosted.