ahhh i see now, so those block checkers must of been pretty bogus, or they used another random account (of which the site owns) to see if that person is online!
not too fused about people blocking me, but if they've blocked me for what ever reason, id rather remove them from my list AND doing so with the plus extension which would be more convenient.
suppose this could be included though, Patchou to setup random accounts just to check if someone is online or not through the plus extension!?
it could use 3 different accounts at least, and work out the average to see if they are online or not. that way it'll remove a random account if people get wise to this and block it manually to stop detection.
a reckon its possible to do, would be worth trying it out and see how it goes!
also if their would be a problem with Patchou using too many accounts, let users create a new random account which the plus extension will use for block checking. this method will probably work better, as that random account will be different for each user and would be harder to detect if people dont want to be found out blocking that contact.
bit of a mouthful but am sure you all get the idea!