No matter how things work in different algorithms and how pages rank in relationship to each other, it is quite evident that social aspects are becoming increasingly important for search. For many news pages, social media has become the number one referrer and we are seeing some evidence that websites in the travel vertical and other such experience/story based content websites are moving towards the same pattern.
This is probably the first lesson on social search with many to come. I suggest you experiment with this a lot as I still see stuff I am not expecting every day. What puzzles me is exactly how Google ranks different profiles, information etc in relation to each other. There will be several ways in which you can optimize a website for social search in the future. I have already found a couple, but this is the most basic way in which you can appear in the bottom of the search results on the first page.