This is complicated and the risks real.
My company helps companies grow (ie we market their brand / company) in many different ways, including building a Facebook fan base, so it looks totally organic or by establishing personal branding.
Can I endorse a company or product when they pay me to help them market their company with social media? Apparently it is illegal. Even if my endorsement mirrors my real beliefs in a product or company. 
Kinda like me endorsing a laxative product – like I really use it and love it, even if I don’t. If I am paid for my marketing services, Facebook building or other social marketing and seem to endorse it (ie “Like” it), the FTC finds it illegal.
Are You Disclosing? What You Need to Know about FTC Rules and Social Media | Social Media Examiner.
