NEW YORK - Facebook Inc CEO Mark Zuckerberg fielded questions about the No 1 social network's slowing revenue growth and its $1 billion purchase of Instagram as he kicked off a cross-country roadshow to promote the company's $10 billion initial public offering.

Wearing his trademark "hoodie" sweatshirt, jeans and sneakers, the 27-year-old chief executive said he would do the Instagram deal again if he had to, according to attendees at the event.  

Facebook Inc CEO Mark Zuckerberg is escorted by security guards as he departs New York City's Sheraton Hotel May 7, 2012. Facebook Inc. kicked off its IPO roadshow in New York on Monday, attracting hundreds of investors to the Sheraton as the world's largest social network aims to raise about $10.6 billion, dwarfing the coming-out parties of tech companies like Google Inc and granting it a market value close to Amazon.com Inc's. [Photo/Agencies]

Hundreds of investors showed up for the presentation at New York's Sheraton Hotel, which was closed to the media, on Monday.

The world's largest social network aims to raise about $10.6 billion, dwarfing the coming-out parties of tech companies like Google Inc and granting it a market value close to Amazon.com Inc's.

The 8-year-old social network that began as Zuckerberg's Harvard dorm room project indicated an IPO range of $28 to $35 a share on Thursday, which would value the company at $77 billion to $96 billion.  

The size of the IPO reflects the company's growth and bullish expectations about its money-making potential as a hub for everything from advertising to commerce. Many investors say they expect Facebook to raise its offer price-range as the roadshow progresses from New York to major cities such as Chicago, Boston and San Francisco.

Amid the hoopla of one of the most closely watched IPOs in years are persistent concerns about Facebook's longer-term growth and Zuckerberg's majority control.

Zuckerberg, who will have roughly 57 percent voting control after the IPO, personally forged the deal to acquire mobile app maker Instagram in a matter of days last month with little involvement from Facebook's board of directors, according to media reports.

Asked about the deal by an attendee at the event, Zuckerberg said Facebook's management had discussed a possible Instagram acquisition at length in several meetings. Facebook decided to act when it saw Instagram's user data cross a "tipping point" from which they believed it would grow significantly, he said.

He said Facebook moved quickly to strike a deal when it became clear that Instagram was open to being acquired.

Zuckerberg was accompanied by finance chief David Ebersman, who was wearing a suit and tie, and Chief Operating Officer Sheryl Sandberg.

Investors managed to ask five questions during the event on Monday, including a query about Facebook's potential plans to enter China, the world's largest Internet market by users.

Facebook's emergence as a cultural phenomenon whose beginnings were depicted in the fictionalized 2010 film "The Social Network" added a palpable level of energy and buzz to Monday's event.

One investor was overheard joking that the event should have been held in New York's Madison Square Garden, home of the Knicks basketball team and a standard venue for rock concerts.

Investors had formed a line outside the Sheraton Hotel about an hour before the roadshow started on Monday morning, as a nearby media throng awaited the arrival of Facebook executives and elicited inquiries from curious passers-by.

"This is unlike anything we've ever seen," said another investor who was at the event.

Morgan Stanley banker Michael Grimes took the stage to begin the formal presentation as the audience of investors lunched on Cobb salad, ice tea and cookies, attendees said.

With 900 million users, Facebook is challenging established Web businesses such as Google Inc and Yahoo Inc for consumers' online time and advertising dollars.  

Susquehanna Financial Group analyst Herman Leung said in a note to investors on Monday that he expected Facebook's revenue to grow 40 percent this year and 33 percent in 2013.  

He said the $28 to $35 range for Facebook shares was an "attractive" valuation that provided a "compelling entry point" for investors.

In a separate note published Sunday, Pivotal Research Group analyst Brian Wieser put a $30 price target on shares of Facebook.  

"Our conversations with investors to date suggest that concerns around revenue growth and the absence of mobile monetization will linger for some time," said Wieser.  

But, he added, "we would not be surprised if the stock trades up above the IPO price on retail interest in the company over the near term."