The filter allows limit of results list: display only those strings in which there is specified substring; or display all strings except those in which there is a specified substring.
Split different substrings by spaces.
Column Visitors shows the total number of unique visitors, who have come from this source. In this column visitor can be counted in several lines.
You can configure different ways of identifying sources in the Sources section. Some types of sources are counted automatically, for example, by UTM and _openstat tags (see below), by transitions from the most popular search engines and socials networks, referrer domains (from which site came).
By bookmarks — under this definition fall those visitors who is impossible to determine where they came to the website. For example, this is visitors who came by links "Bookmarks", entered the site address in the browser bar, followed the links from instant messengers, moved from the https site to the http site, or sits at an anonymous proxy server that cuts the browser headers.
UTM tags (Google tag), _openstat (openstat tag, used by Yandex.Direct, Begun and others) or gclid (Google AdWords tag), set in the URL of the page are automatically considered as sources. You can enable the installation of such tags at the advertising campaign settings page or add the tag by self in the URL: add UTM tag, add _openstat tag (base64 tags are preferred).
UTM and _openstat tags are shown in format UTM/Openstat: source;campaign;content;medium;term