Correlate: Derives complex events from message or event streams.

相关：从消息或事件流中派生复杂事件。

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For example, if you want to send a message to someone you heard speak at an event but are not friends with, or if you want to message someone about a job opportunity, you can use this feature to reach their Inbox.

FORBES: Facebook Test Lets Strangers Pay For Message Delivery