Social proof is one of the big keys to any kind of marketing, on or offline. Businesses have been soliciting testimonials ever since the existence of commerce. On LinkedIn, recommendations are one form of social proof, and they are very, very important. Yet, most users have few if any of them! Let’s talk about how you can get more recommendations so that you can beef up your profile and start making LinkedIn work for you and your career or business interests. In general, you need to first give what you want to get. My Dad used to tell me that if you want friends, you have to first be a…