We have all heard about Alex Tew and his pixel adverts on the milliondollahomepage. Now if I was to talk about any online gimmick this is definitely the place to start. The reason why we class this as an online gimmick is due to the fact Alex Tew came up with a great marketing idea which paid off handsomely for him, others have tried to achieve the same success with his idea and have failed. It was a one time idea because it did not have the unique selling point once other people started promoting pixel advertising sites all over the net.
The definition of a gimmick is - a trick or device intended to attract attention
Gimmicks are all about selling an idea that people will embrace, something that will attract attention, something that people will be wanting to tell their friends so you will get unlimited advertising through word of mouth. For a gimmick to work it needs to have a unique twist to it, something you have never seen before.
If you have an idea that you think is unique I would suggest researching the internet to see if anyone else is already promoting this unique idea. If you find that your idea has not been used before I would suggest preparing your idea in secrecy