We need to be careful not to read too much into this data without context. "Liking" a fan page used to be a much lighter thing before the FB interest graph became interwoven into other applications & this new search feature.

I used to "like" friends fan pages without much thought, if they asked me to. Re: Ashley Madison, there are married people who work there and will choose to "like" their employer. This represents a small number of users, but is meant to show that there are legitimate use cases.