We can see that "there are couple services who will offer Facebook likes for sale". Facebook team has started working on these fake likes and respective accounts. Facebook officially announced the same on Aug 31st in their blog by stating that "they are improving their site integrity systems".
Techcrunch also published a post on Sep 27th that "Facebook is deleting fake accounts". Mashable also published a post (Facebook begins eliminating fake likes) on the same day and confirmed that "they got confirmation from the Facebook spokesman Adam Isserlis regarding the same.
Texas HoldEm Poker is a big loser with this update as its lost "96,000" likes. Other popular pages also lost likes Farmville lost 45,000 likes, Lady Gaga lost 34,000 likes, Rihanna lost 28,000 likes, Shakira lost 26,000 likes etc.