That’s testament to the impressive numbers Facebook has posted in its relatively brief history. More than 40 percent of American adults log in to the site —to share news, personal observations, photos and more— at least once a week. In all, some 900 million people around the world are users. Facebook’s revenue grew from $777 million in 2009 to $3.7 billion last year. And in the first quarter of 2012 it was more than $1 billion.

Just a third of those surveyed think the company’s expected value is appropriate, while 50 percent say it is too high. Those who invest in the stock market are more likely to see shares as overvalued, 58 percent said so. About 3 in 10 investors say the expected value of shares is fair. Facebook on Tuesday lifted the expected price for its shares to $34 to $38 apiece from $28 to $35 each.