Shareholders file lawsuit against banks and Facebook CEO, Mark Zukerburg

The fallout from Facebook Inc's messy initial public offering widened on Wednesday as shareholders sued the social network and its bankers while a trading firm revealed a massive loss on the shares and threatened to seek "remedies." The Nasdaq stock exchange also came under further pressure as a source close to the situation told Reuters that NYSE Euronext had opened discussions with Facebook about a potential stock listing there. Nasdaq also faces litigation from angry investors.

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