If you would have paid attention to the last topic in this section, you would have noticed that Jer9 already made a topic about this here.
<a class="postlink-local" href="http://www.lethal-zone.eu/lethalchat/gabe-newell-intruders-accessed-steam-database-t10075.html" onclick="window.open(this.href);return false;">lethalchat/gabe-newell-intruders-accessed-steam-database-t10075.html</a>