Many of these types of posting on Facebook are phishing scams. If you don't recognize the orginal poster, consider yourself phished!
Snopes.com linked to this article, which explains why individuals create these types of pages, including photoshopping all those "my ___ says if I get 1,000,000 likes then ____. The writer then explains why we shouldn't "like" or comment on any of these.
About All Those Facebook "Like" Scam Posts