It ensures that only valid users can use the application (authentication).

它确保只有有效用户才可以使用应用程序(身份验证)。

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If you want to restrict the users who can access a share, use the valid users parameter.

如果您希望限制可以访问共享的用户，那么可以使用valid users参数。

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Once established, all valid users can reuse this trusted connection without re-authentication.

连接建立后，任何有效用户都可以重用该可信连接，无需重新验证。

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With a growing number of local bars and restaurants accepting Bitcoin as a valid method of payment, Foodler is now offering its users the option of paying with Bitcoin at Foodler.com and via the Foodler iPhone app.

WSJ: Foodler Becomes First Food Ordering Service to Accept Bitcoin Payments

So since this area is actually where the comparison to Facebook is valid, how can Google both increase the proportion of active users as well as boost engagement on the Stream?

CNN: Google+ creator: Don't call it a social network

These are all valid concerns, and it seems that Adobe have thrown existing users a small bone by saying that it will continue to provide bug fixes for Creative Suite 6 owners, although for how long is not known.

FORBES: Adobe's Creative Cloud Move Causes Outcry And Confusion