Zuckerberg, who said more than 350 million of Facebook's half-billion users now actively send and receive messages on his website, did not expect people to stop using traditional email tomorrow.

扎克伯格说Facebook的5亿用户中有超过3.5亿的用户正积极地在网站上发送和接受消息，他并不希望今后人们停止使用传统的email。

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By simply restricting European users from sending more texts than they receive, Pinger is able to eliminate its messaging costs entirely.

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The SEC, which laid out its plan last week for security-based swaps, wants to ensure customers trading on these platforms can request a quote from a single dealer if they so choose, while the CFTC, which oversees the rest of the market, wants to require swap users to receive prices from no fewer than five dealers at a time.

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And it features what is called mobile Internet protocol (IP), a packet data service that requires users to pay only for the amount of data they send and receive rather than for the amount of time spent on line.

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