“… the U.S. Federal Trade Commission (FTC) issued new guidelines that require bloggers to ‘disclose material connections’ for product or service endorsements. In fact, according to The Public Relations Society of America (PRSA), ‘People who blog, tweet or use Facebook to post opinions about consumer products could be fined $11,000 for repeat violations of new federal disclosure rules.’
http://michaelhyatt.com/five-ways-to-comply-with-the-new-ftc-guidelines-for-bloggers.html