Try the offical Lego galleries,especially the main one an perhaps,brickset,MOC pages, Flickr possibly or possibly by creating a Facebook/Twitter page calling all LMB surviours from the great purge however that my be very risky an seriously jepodise the safety of this site so run it past an official administrator even though I think the outcome will be no about a FB or Twitter page. The galleries are you best bet but chances maybe slim. Good luck in finding your friend an others although be desreate about telling them the name of this site an do it perhaps in a word jumble like Message eternal boards & tell them later to shuffle the words in their browser or tell them via a riddle/wordplay.