Remember the slogan of Obama "Yes, we can"? Well, a couple of weeks back, there were unexplained posters of French president Nicolas Sarkozy with the tag "Yes, you must". To check out the photos, click here. It was a streetmarketing operation that got a lot of buzz because everybody was wondering who was the author of the posters and what it meant. Some thought it was the Youth wing of Nicolas Sarkozy's political party. But then, Greenpeace revealed that they were the maker of this campaign to remind the president of the promises he made during the presidential campaign.