Now, you can markup your web sites so that if your brand comes up in the search results, it can potentially show social profile links to your social channels. Google supports showing social profile links to Facebook, Twitter, Google+, Instagram, YouTube, LinkedIn and even Myspace.
They started doing this in November by showing social profile links for personalities and now they've expanded it for brands.
Here are the technical guidelines and details on how to implement this.
This is how it looks on companies like Google, Yahoo, Microsoft and Apple:
So if your brand comes up with a knowledge graph and you want to control the social profile links, you can try to now.
Forum discussion at Google+.