Social media, until recently the hottest sector in Silicon    Valley, is now getting the cold shoulder from investors,    downgrades from analysts and criticism from some fans.  
    But while the hype around social networking companies has    deflated, the industry is no where near a bust, experts say.    Unlike the dot-com bubble more than a decade ago, when    companies with no profits and scant revenues saw soaring    valuations, many social media companies are pulling in millions    in revenues as they change the way people work, play and    communicate.  
    "The reality is, they are going through amazing growing pains,"    said Tim Bajarin, president of Creative Strategies.  
    Many social media companies burst onto the Internet as    culture-changing enterprises Now, though, some are being    hammered by Wall Street.  
    Investors are dismayed with Facebook and    Zynga.    Twitter,    meanwhile, triggered a public relations disaster when it shut    down a British journalist's account after he criticized    Twitter's Olympic partner, NBC -- and then reversed itself. And    some advertisers are skeptical that social networks are the    right platform for their ads.  
    Still, most analysts say the future is far from gloomy.  
    "They are still innovating at Facebook," said Kevin Lee,    co-founder of Didit, an online  
    Nonetheless, investors are on edge. Facebook's market value has    collapsed to about half of the record $104 billion valuation    the company set when it began selling shares in May. "The jury    is in: Facebook is not and will not be a second Google    (GOOG),"    IDC analyst Karsten Weide wrote after the company reported its    first quarterly earnings last week that revealed its revenue    slowing.  
    Social network companies Zynga, Pandora and Groupon also are    trading far below their initial public offering price.  
    Both San Francisco-based online game company Zynga and Facebook    have also been hit with lawsuits from investors. In Zynga's    case, executives and early investors are accused of knowing the    company was struggling when they sold millions of shares before    announcing a substantial drop in projected earnings. Facebook    and its banking partners have been targeted by lawsuits    accusing them of misleading investors by failing to share    information passed on to select Wall Street analysts that    warned of less-than-rosy financial results for its first    quarter as a public company.  
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Social media, until recently a hot sector, faces growing skeptics