In September Facebook introduced the social world to frictionless sharing and Action Verbs. With the rollout of its Open Graph, the future of engagement would be driven by both implicit and explicit actions. Explicit actions require the user to click a button. Implicit actions only require that the user run an app designed using the Open Graph platform where updates (or Action Verbs) are sent to the timeline automatically.
The goal of an Open Graph strategy is not to just send an interesting Action Verb into the timeline to entice a click, it must unlock a microcosm of fellowship. The Open Graph is an open invitation to creativity and innovation. At the same time, it’s also an opportunity to introduce ways to expand relevant shares and app-generated engagement from social graph to social graph.
Read more details on open graph at briansolis