<p>SAN FRANCISCO Perhaps Facebook's chief executive, Mark Zuckerberg, should ditch the hoodie and dress up as a mobile phone for Halloween.</p><p>After all, that's how half of his company's users connect to the social network and where half of its advertising revenue comes from.</p><p>He just has to be careful not to scare away the kids because the youngest ones are already starting to go elsewhere.</p><p>Facebook, which operates the largest online social network, reported Wednesday that its profits doubled in the third quarter, to $621 million, after excluding expenses related to stock options.</p><p><a href="http://www.nytimes.com/2013/10/31/technology/rising-mobile-ad-sales-propel-facebook-profit.html">Keep reading...</a></p><p>Read also:</p><p><a href="http://www.usatoday.com/story/tech/2013/10/30/facebook-reports-mobile-revenue-boom/3315123/">Facebook beats Street; shares go on roller-coaster ride</a> (USA TODAY)</p><p><a href="http://money.cnn.com/2013/10/30/technology/social/facebook-earnings/">Facebook admits young teens are losing interest in the site</a> (CNNMoney)</p><p><a href="http://www.reuters.com/article/2013/10/31/us-facebook-results-research-idUSBRE99U0HX20131031">Facebook shares back on roller-coaster, but analysts see value</a> (Reuters)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=dLU2S1ODHNWFqvMT8oZpN9tYgjriM&ned=us">380 additional articles.</a></p>