If you run a popular Facebook Page and noticing that the number of Likes on it are going down significantly, you can blame Facebook for that.
The company is currently in the process of spring cleaning. They are removing accounts and likes which they believe are fake.
Facebook had announced recently that they would be taking such steps to ensure that the number of Likes on pages are a more accurate representation of the number of people following that page.
Twitter too suffers from a similar problem and we are hearing reports that they might simply remove the follower count focusing on visibility factor.
Facebook Likes and Twitter Followers are two huge parameters to measure the popularity of a brand or a product.
And there are tons of services online that promises to boost the number for a fee. Remains to be seen if Facebook and Twitter can get rid of this mess.