More than 70,000 Twitter users are blocking major brands on Twitter

"More than 71,000 Twitter users have started blocking hundreds of major brands, including Nike, Pepsi, Uber and McDonald's, in a boycott aimed at putting pressure on the social platform to permanently ban Alex Jones, the far-right conspiracy theorist and InfoWars host, according to a report in Adweek.
Blocking brands could limit the reach of their promoted tweets and other ads from showing up on users' timelines. Other brands being blocked include Red Bull, Starbucks, IBM, Cisco, Microsoft, Wells Fargo, Visa and Capital One."

Source:  Marketing Dive, 17th August 2018

Note - If you block someone on Twitter you won't see their tweets, even their paid/promoted tweets.

More than 115,000 websites took part in the protests against SOPA & PIPA

"More than 115,000 websites participated in the protest, with as many as 50,000 sites, including Wikipedia, Craigslist and Wordpress, blacking out their sites, per Fight for the Future, one of the organizers.
Wikipedia, the largest website to participate, blacking out its entire English-language site, reported that 162 million landed on its page and 8 million looked up their congressional representative information in order to protest the bills.
Google blacked out its logo and directed visitors to its petition, which 7 million signed.
Perhaps the most important stat: 20 senators pulled their support for PIPA, which was slated to be brought to the floor next week. Six senators that had co-sponsored the bill removed their names from it."

Source:  AdWeek, 19th January 2012