What this also means, is that if you share your YouTube video to a Google+ community and it gets commented on, that comment will show up on your YouTube video on YouTube as well. This is a great way to get some initial momentum on your video, so try to find communities to join in your niche and then make videos you think they will enjoy to share there. Just don’t post to often or you’ll likely be banned.
And don’t forget – YouTube and Google+ are now linked! This means that if you spend some time building your Google+ circles, they will all be shown your new videos when you upload them. A great way to do this is to be active in discussions in communities, to take part in hangouts and to plus one other people (you normally get a reciprocal +1). Have a G+ button on your website if you have one too and this will help you to gain more people in your circles.