"Facebook’s ambitious plan to weave together the actions we take across the web and engineer a social network replete with frictionless sharing is finally ready to be deployed, VentureBeat has learned. The remaining pieces of Facebook’s new Open Graph are in the final stages of testing and are nearing release" - from here.
I am really not sure, why frictionless sharing is good. If I just read something it does not mean that I will automatically share that with my friends. And it is not about privacy, it is about spam :)
P.S. And here you can share your search query with your FB circle: Ask friends. And it requires friction :)