Dislike button on Facebook,advertiser are worried.

You hit like button of Facebook status if you liked that but if you did't like that what will you do? will you stay just quietly ..? Staying quietly doesn't mean liked..? And sometimes friends updates very griefful status on Facebook.

It is uneasy to show sympathy by hitting like button of Facebook while a friend updates a sad status about an accident,death..etc. If you hit like button it will means that you became happy in the sorrow of your friend.So like button wont be the good way to condole in the sorrowful status of friends.
There is no options to dislike caused peoples are obliged to press the like button but now Facebook will keep dislike button along with like button.
According to the funder of Facebook Mark Zuckerberg thinking about the dislike button in Facebook.
He said,users mostly asked for the dislike button in Q and A program held in Facebook headquarter of California.
According to the BBC "we are thinking how users easily can express their sympathy in expanded way' Zuckerberg said.
Everyday users hit like button 4,500,000,000 times as per the data of Facebook.We often see in the Facebook groups peoples are selling the artificial like on the Facebook status.In product of some kinda company they have made artificial likes to show that their product is original.Now Facebook has started to process of legal punishment against the company of artificial likes.
The advertiser are worried about the dislike button of Facebook. Competitor company may make a fake likes on post of product to make their market down.