Social bookmarking websites provide content-sharing services by adding a backlink. Usually, social bookmarking services are free of cost to use. Reddit, Digg, Kaancy, Xamly, and StumbleUpon are popular social bookmarking websites. Top Dofollow Social Bookmarking Website List 2022
Source: https://developers.dialpad.com/discuss/66ebf5fb8f892e000f7e608c