Facebook Inc plans to raise as much as $12 billion in Silicon Valley\'s largest IPO, dwarfing the coming-out parties of tech companies like Google Inc and granting the world\'s largest social network a market value close to Amazon.com\'s. The eight-year-old social network that began as Mark Zuckerberg\'s Harvard dorm room project priced its initial public offering at between $28 and $35 a share on Thursday, attaining a valuation of as much as $95.9 billion at the high end. If an over-allotment or \"greenshoe\" option is triggered, the company could end up raising close to $13.6 billion, according to a Thursday prospectus. Investors are expected to flock to the highly anticipated IPO, though some have voiced concerns about the social network\'s longer-term growth. Last week, Facebook reported its first quarter-to-quarter revenue slide in at least two years, a sign that the social network\'s sizzling growth may be cooling just as it prepares to go public. Its stock should begin trading in about a week or two. Facebook, which plans to list its stock on the Nasdaq under the ticker \"FB\", will begin meeting with investors on Monday. Facebook\'s capital-raising target far outstrips big Internet IPOs that came before it. Google raised just shy of $2 billion in 2004, while last year Groupon tapped investors for $700 million and Zynga raked in $1 billion. At close to $100 billion, Facebook\'s capitalization will rival Amazon.com\'s and Cisco Systems Inc\'s market values of just over $100 billion, while surpassing those of older technology companies such as Hewlett-Packard Co and Dell Inc put together.