Facebook Like Button
1,046,401 websites

Facebook Like Button is free to use

https://developers.facebook.com/docs/plugins/like-button/

Facebook's Like button is the quickest way for people to share content with their friends. A single click on the Like button will 'like' pieces of content on the web and share them on Facebook. You can also display a Share button next to t...

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Yoast SEO
2,200,254 websites

Yoast SEO offers both free and paid options

https://yoast.com/wordpress/plugins/seo/

Wordpress SEO Plugin

Market Share by Top Websites

1 Yoast SEO is leading in Top 100K Sites, Top 1M Sites and The Entire Web.

2 Facebook Like Button is leading in Top 10K Sites.

Websites Categories

1 Yoast SEO has better usage coverage in more websites categories. Including Computers Electronics & Technology, Science & Education, Health, Food & Drink and 11 other categories.

2 Facebook Like Button is leading in Arts & Entertainment, Games, News & Media, E-commerce & Shopping and 5 other categories.

Geography

1 Yoast SEO is leading in most countries, including United States, France, United Kingdom, Italy and 157 other countries.

2 Facebook Like Button is leading in Japan, Czech Republic, Taiwan, Mongolia and one other country.