Crowdsourcing is when a certain company wants their costumers to help sell their product by creating an attention getting ad or other means of promotion. One example would be the Doritos annual commercial competition. The winner of the "Crash the Superbowl" competition gets their ad placed in the Superbowl with an opportunity to possibly make more ads for the Doritos brand. Since the ad was created by a consumer rather than a public relations executive it may be more relate-able to the other consumers and it will encourage people to buy Doritos so they may used them in their commercial shoot. When their are people all across the nation buying bags of Doritos in hope of getting a 30 second slot in the Superbowl the competition alone raises the marketing sales.
Finally, peer pressure, the type of advertisement that no one gets paid for yet is probably the most affective and most deeply embedded into your mind. Peer pressure works because it is a lot more personal and requires repetition majority of the time. Your friend may constantly drink a type of soda and you may not drink soda at all; however, one day you are with out any other beverages so your friend offers you the soda they always drink and after a few refusals you give in. Later you decide get stuck in the same situation where your only options are sodas and all of your friends are drinking the same soda your friend was drinking earlier because you are a none soda drinker you going to drink what your friends drinks again. On a later date your friends is no longer around and you have an option of sodas and nothing else, you are most likely to buy that soda again.
As you can tell ads surround us on a daily basis in a number of ways. Some try to make it seem like it is your time to shine and do your part as a consumer to help get other consumers and as a prize you can continue to do so. Others try to subliminally shove it in your face throughout movies and shows encouraging you to imitate the stars and use those products so that they can pay for more advertisement which helps pay for your shows. Some just wait for themselves to be popular enough that people will suggest their products to others to help them sell rather they do it themselves. Regardless of how you feel about their impact, they will always be here like Marshall McLuhan said "Ads are the cave art of the 20th century."