That's just FUD.
What possible use would there be for a list of Facebook profiles and their IP addresses?
You can just go on Facebook and get as many profiles as you'd like directly. The IP only gives you an ISP that the user used once at some point in time which means a very crude approximation for location (at the city/country level) which you could probably beat by looking at the profile itself.
These aren't just random profiles, they're security interested Hacker News browsers. And they might be correlatable with comments in this post.
IP gives you more than just location. If you own a website, and someone from an IP visits your website around the same time as this log, there's probably a good chance they're the same person. So you could then correlate a username on your website with a Facebook profile.
The whole point of potential attack is to correlate a username on the attacker's website with a Facebook profile.
