Robert_Charlton - 7:59 pm on Sep 28, 2013 (gmt 0)
This is for Google+ only, so don't expect twitter and facebook in there.
Sorry if my post may have misled. Yes, of course the results are for Google+ only. As I noted the "search links leading to other social sites" appear below the slider... and the searches they lead to are on those other sites.
The opportunity, as I see it, is that for a while, as people test this out, there's likely to be more exposure for hashtag searches in general, and some will spill over to the sites linked to. You'll have to post them on the individual social sites you're targeting.
Also, fwiw, the auto-complete suggestions on Google and Twitter, while resembling each other in their broader zeitgeist, do differ in the details and order shown.