After the changes made to the forum to not show the last login, isn't bpip.org a bit of a 'snitch'? For example, if I go to ibminer's profile on the forum, I see “last active: recently”, while on bpip.org it tells me that he was active 3 days ago. To be more specific, for example, LoyceV has the same option on the forum “recently”, while on bpip.org I can see that he was active 5 minutes ago. You can see it clearly if you watch the list of most merited profiles, for example.
IIRC this timestamp is updated if e.g. the user makes a post, sends merits, etc, which you can also see on Bitcointalk itself if you look at user's last posts or recent merits. If the user is just browsing the forum then BPIP won't be able to "snitch".