Advertisement Checking out LinkedIn Companies | | | By Adam Kleinberg LinkedIn in has become one one of the Big Three in social media (along with Twitter and Facebook), but until now there has been little to no reason for brands to give much thought to their presence there. While the professional networking tools for... | | | Advertisement | Advertisement Free White Paper Research | We're always eager to hear what you have to say about our website and how to better serve you. Give us your feedback! | |