Bug: "News" feed shows user comments on private decks

In my news feed on my main Profile page (/users/me), it shows people modifying decks and making comments upon them.  I was interested in my friend's Infect deck so clicked through, only to be told that it's Private and that I couldn't see it.  That's fine, but then why is it showing up in my News feed in the first place?  If we were going to be playing against each other, arguably me knowing to expect a UG Infect deck is potentially what he is trying to avoid.

I don't know what else isn't filtered out, but at least comments upon Private decks aren't being filtered.

Thanks!