After the offering, the company will have about 160.3 million shares out, not counting a 3.4 million share over-allotment option, which clearly seems likely to be exercised.

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However, if the share price is 90 the option is worthless, and the CEO does not make anything.

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Posterous will try to carve out a space for people who do not want to share on Facebook and would prefer a more simple private option.

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As with almost everything on Facebook, you have the option to share it publicly, with fewer people (like just friends or just your family) or not at all.

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