This is a poorly named post. It's not "logging" anything, in all likelihood this information is discarded immediately. This shows that the information is sent to facebooks server, but I'd bet money that it's simply the default behavior of their text box widget to use ajax-based 'autocomplete', with a null backend for things like this.
It'd still be captured by anything sniffing the network. Then again, tracking everything a user does on one's website seems to be the norm these days. Not sure there should be a disclaimer before the data is captured, though?
I mean I agree that it's not a good thing that its captured at all, but it's going down a dangerous road to ascribe literally everything they do as malicious. The term 'logging' has a well-defined meaning in the tech community that implies the data is being stored long-term, and no use cases or evidence are provided for that.
I dislike facebook as much as the next person, but too much panic becomes harmful to larger goals.
The point is anything sent to Facebook must be assumed logged until proven otherwise.
That's a sad state of affairs.
This tirade against Facebook is starting to slip into hysteria.