개념
소셜 북마킹(Social Bookmarking)
https://m.blog.naver.com/PostView.nhn?blogId=koshamedia&logNo=120096099175&proxyReferer=https:%2F%2Fwww.google.com%2F소셜 북마크 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%86%8C%EC%85%9C_%EB%B6%81%EB%A7%88%ED%81%ACThe 10 Best Social Bookmarking Sites to Increase Your Traffic
https://www.brandwatch.com/blog/10-popular-social-bookmarking-websites/30 Social Bookmarking Sites to Boost SEO & Drive Traffic
https://medium.com/@manju.rai/30-social-bookmarking-sites-to-boost-seo-drive-traffic-a0789b56f34aWhat is social bookmarking? | Sprout Social
https://sproutsocial.com/glossary/social-bookmarking/