Haha wow cool Marigold, at least I learnt something new today...
I tried that weblink that you suggested, and those friend(s) who disappeared cannot be found. So I guess it works the same way as the SL search though.
I just wonder if it's true that some residents are put on hold due to payment issues, will they even receive any offline messages after that. LOL I don't think any of the vanished friends blog. *Cheers!*