In Google Analytics added advanced filtering functionality by criteria (events). You can filter the audience in a couple of mouse clicks, and all standard Google Analytics tools are available for the filtered group. What is interesting, you can invent and create absolutely any events (for example, a filter for those who watched a video on the site, or for those who clicked on an advertisement).
Technically it works like this. As soon as you create new unique criteria for filtering (event), a new code for the counter is generated and the system begins to register these events.
Examples of events and related code can be found here .
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The guys from Google took a demo video to show how this system now works.