<p>Big mutual-fund managers, led by Fidelity Investments, continued to shed Facebook shares in July as the social-networking company's stock headed toward a new low.</p><p>Do the moves signal a buying opportunity for bargain hunters?</p><p>Not just yet, say some financial experts, who argue the funds' actions are just the latest sign that Facebook's stock hasn't yet hit bottom.</p><p>Facebook has a market valuation of about $41 billion, or, including restricted stock units and options, about $52 billion. That is down from $104 billion at the time of its May 18 initial public offering. Shares closed at a new low of $17.73 on Tuesday and finished Friday at $18.98, down about 50% from the company's IPO price of $38.An Early Supporter</p><p><a href="http://online.wsj.com/article/SB10000872396390443589304577633802631006764.html?mod=googlenews_wsj">Keep reading...</a></p><p>Read also:</p><p><a href="http://www.ft.com/cms/s/0/65ac2576-f86c-11e1-b0e1-00144feabdc0.html">Facebook&#039;s dismal IPO emboldens reformers</a> (Financial Times)</p><p><a href="http://www.bloomberg.com/news/2012-09-06/facebook-investors-know-exactly-whom-to-blame.html">Facebook Investors Know Exactly Whom to Blame</a> (Bloomberg)</p><p><a href="http://www.investmentnews.com/article/20120907/FREE/120909962">Mark Cuban: I know who&#039;s to blame for Facebook fiasco</a> (InvestmentNews)</p><p>Explore: <a href="http://news.google.com/news/more?pz=1&ned=us&ncl=dqZs9IHYI9e8X3MyPpqOi0P9Px7sM">58 additional articles.</a></p>