How to make $300 a year with LinkedIn

Flippers are a booming sector of the social networking site.There are more than two million registered flippers in the United States, according to the site, and the number is projected to grow to more than three million by 2021.Facebook flippers make more than $30,000 a year, according the site.And LinkedIn flippers can earn as much as $300,000 annually, according a LinkedIn earnings call with inv...