"Barkov.net" offers the same features as "Cerebro," "TH," and other similar services. With it, you can quickly find a target audience that is highly likely to be interested in a specific topic, export it to a file, and use it for placing targeted ads on VKontakte. The selection is done using popular methods: by activity, similar groups, and intersections. Customizable scripts allow you to set scenarios of any complexity. The main downside is that as the complexity and size of the initial database increase, so does the volume of parsing. This happens in browsers, so it's recommended to close all open tabs and not overload the computer for faster system performance. If you accidentally close the parsing tab, you'll have to start over. However, this drawback is offset by free access. All scripts are available, but there are limitations on calculations.