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The 17 percent slide in the shares took Facebook’s market capitalization to $48 billion — half its IPO launch value of $100 billion in May.

The latest slide cost CEO Mark Zuckerberg, the 28-year-old who founded Facebook in his Harvard dorm room, around $2.3 billion, based on his shareholding.

The social network just beat revenue expectations on Thursday in its first quarterly earnings but the company failed to reassure investors about its future prospects.
XYL wanted to invest. I did not.