bookmark

noun 0.696

bookmarklet

noun 0.605

bookmaking

noun 0.589

social networking

noun 0.583

tagging

noun 0.540

folksonomy

noun 0.530

blogging

noun 0.525

microblogging

noun 0.521

commonplace book

noun 0.519

geotagging

noun 0.517

social collaboration

noun 0.508

scrapbook

noun 0.502

guest book

noun 0.502