Dan Kaminsky
... that computer security expert Dan Kaminsky demonstrated a security vulnerability by setting up Rickrolls on Facebook and PayPal?
... that <a href="./Computer_security" id="mwBks" rel="mw:WikiLink" title="Computer security">computer security</a> expert <b id="mwBkw"><a href="./Dan_Kaminsky" id="mwBk0" rel="mw:WikiLink" title="Dan Kaminsky">Dan Kaminsky</a></b> demonstrated a security vulnerability by setting up <a class="mw-redirect" href="./Rickroll" id="mwBk4" rel="mw:WikiLink" title="Rickroll">Rickrolls</a> on <a href="./Facebook" id="mwBk8" rel="mw:WikiLink" title="Facebook">Facebook</a> and <a href="./PayPal" id="mwBlA" rel="mw:WikiLink" title="PayPal">PayPal</a>?