A list of title and summary words that appear in the most and least connected LinkedIn profiles. Of course, if you merely throw these words into your LinkedIn, it smacks of inauthentic content. Use them only if they truly apply to you. (My LinkedIn account).
From this list it is obvious that LinkedIn is becoming the platform for job seekers and recruiters.
Dan Zarrella uses evidenced based approaches to social media (finally someone) and has access to a great quantity of data. I highly recommend his new book, Hierarchy of Contagiousness.