opsdo has two goals - to allow people to search many information sources which mainstream search engines do not cover well and to allow people to search groups of such sources -- e.g. RottenTomatoes, IMDb and Amazon.
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In Activity Streams, verbs are their own objects, and the variety of actions that can be represented is limited only by the standard itself. Providers can also use verbs outside the standard, taking the chance that they'll eventually be incorporated, or that a downstream client could parse them anyway. Here's a list of the verbs incorporated in the Activity Streams standard so far: