Turn on your TV today and maybe you’ll see an iPhone ad with Jimmy Fallon followed by 30 seconds of Matthew McConaughey giving his personal philosophy on Lincoln automobiles. To many of us, it’s all part of the endless parade of familiar faces and voices being paid to sell us something, but there’s an important legal distinction between a celebrity who endorses a product they claim to believe in and one who is just picking up a paycheck to appear in an ad. [More]