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.
Not sure if you tried the search string. "More than 100 people" were returned on this and most of them in the top results were indeed employed elsewhere.
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.