What's the alternative? It's not like FB is going to open up their social graph data so Google can use it to improve search results. I believe that issue was discussed when G+ results first showed up in search. For what it's worth, Facebook is also out there trying to compete on search using its social graph information, which is what the recent Zuckerberg announcements talked about.

Oh, so this is about a "Gilt" employee being peeved about the presentation featuring the "Google+ Sign In" integration with "Fancy"(a competitor?)?

Well no, it's not anti competitive because when a user logs into a service she implicitly expresses interest in it, making it more relevant to her in a search scenario, and since it's personalised that "prominence" is unique to said user.