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                                                      NOTICE

I am moving away from AdGuard. Its HQ in Nicosia is only an office for legal and fiscal purposes, like Kaspersky's holding company in London. There is no security or privacy related motivation for this move. Filter lists which are impacted by this decision are: Youtube_AG_rules and PersonalBlocklist. I will remove those lists end of July.

                                                      SOURCES

This blocklist is based on surveys of most used advertising and tracking technology (e.g. surveys of W3C, W3Tech and the digital marketing community itself). The online advertising industry likes to keep lists of top performing companies in the ad supply chain (including advertising exchange platforms). The list and surveys monitored are oriented on Europe and North America, this is the reason this blocklist contains mostly EU and US based advertising and tracking networks.

                            WHY USE A SMALL ADVERTISING AND TRACKING NETWORKS BLOCK LIST?

In advertising the number one (Google) has a marketshare of around 40 percent, Facebook the number two hits the 20 percent mark while the number three (Comscore) just has a little over 2.5% marketshare. For comparison Amazon with its huge webstore generates about the same advertising traffic on its own website. Number 100 on this list is probably used at 5000 websites of the Alexa Top 300.000 websites, while number 500 may only track you on 250 websites of the Alexa Top 10.000.000.

This study performed by the Brave browser developers supports above claim (scroll to "EasyList Applied at the Web" section): https://brave.com/the-mounting-cost-of-stale-ad-blocking-rules/ ==> "WE (Brave) FOUND THAT ONLY 201 RULES ACCOUNTED FOR 90% OF THE BLOCKING ACTIVITY"

                                              LOW UPDATE FREQUENCY

Because this list focusses on the advertising and tracking networks which place the adds on the websites you visit, this list is not subjective to a lot of changes. Simply because it takes a lot of time and money to build such a backbone (ad serving) network. Also the digital marketeers using these networks are a constraining factor, because most don't like to learn how to use new software which makes them reluctant to change to a different advertising platform when the business advantage is marginal.

                                                  ERRORS & ISSUES

Please report site breakage on github by creating an issue. https://github.com/Kees1958/W3C_annual_most_used_survey_blocklist/issues. I will try to correct errors as soon as possible.