http://sn.1w6.org/file/mk-20140515T125427-e6s7hg7.html
@drak the "default" setting you see (and that people are reporting) seems to depend on whether you're previously (in your settings) have disabled showing your avatar in a similar context. The article isn't too clear about that, but some of the comments are (and Gogle's own explanation seems to mention that, too.