Strong ties are relationships with at least three connection streams between you and your friend that extend over several years and multiple shared experiences.

Referent power refers to authority through the motivation to identify with or please a person.

Stickiness is a term that explains how well the site can retain visitors during a single session and encourage repeat visits. The more there is to do on a site, the stickier the site is.

The 80/20 rule says that twenty percent of a brand’s customers purchase 80 percent of its products. This ratio is not set in stone, but it often is surprisingly accurate.

Achievement badges are symbols awarded to show game levels achieved and shared to the community.

An action game is a video game genre that emphasizes physical challenges, including hand–eye coordination and reaction-time.

An activation tool is an advertising tool that engages the viewer to participate, either mentally or physically.

Activity metrics measure the actions the organization takes relative to social media. For instance, an organization might set goals in terms of the number and timing of blog posts, white papers, tweets, videos, comment responses, and status updates it may contribute in social venues.

Activity streams are the news feeds or “wall” (as it’s known in Facebook) social networks use to establish an ongoing point of connection between network nodes.

Ad equivalency value refers to what the value of the mention would be if it had come through a paid advertising placement rather than a volunteered comment.