Getting traction for Google+ Hangouts means finding specific usefulness and application in the real world -- and making a video about it, hoping users will see the efficiency of the video chat feature.
And Google does that. A lot.
The most recent is how to start a Hangout from your Gmail account. Just point the mouse to your Gmail instant messaging, start a Hangout and you're live.
Of all of the ways to start a Hangout, this may be the lowest bar and easiest way (does the Start button move around on the G+ profile pages, or is it just me?).
Being able to crowd-view a YouTube video or share a user's screen are also cool applications.
Putting a virtual beard on someone, tho, is a stretch.