The video for his talk includes others as well; he begins to speak about 12 minutes in, and lasts until ~33 minutes. If you are interested in science & social media, it is well worth taking a look at, especially if you've not used G+ before. What he's accomplished in the past year & a half with this new technology is pretty special.
I would love to see what could come of geosocial activity through G+. It is still very much in the beginning stages. There are a few geos who are using G+ regularly, but there's so much room for so many more, especially those who've not yet connected with fellow professionals. The Geoscience Community has drawn in some new folks this past week, which is excellent, and they've made some great contributions. One feature that geoscientists aren't using much yet are the hangouts. We've used them some in the past, driven largely by +Ron Schott 's geology office hours, but they've not yet really caught on. I'd love to see geos use them as effectively for Earth Science as Fraser has for Space. Geoscience is right at the heart of many of the major problems facing the world today; capturing people's imagination shouldn't be an issue when you've got volcanoes & earthquakes & velociraptors on your team. That could be really fun.