An (e.g.) 1/2 cent payment connected to the current Like button (whether it was credited to the likee or something else) would stop the Facebook Fraud problem by making them non-viable for clickfarms.. and still not seriously impact the original button's usability?

for instance a user could designate a charity recipient for his likes

Characteristics of the Monied "Like" Button http://culturalengineer.blogspot.com/2013/12/characteristics...

One-Click Micropayment Capability for Volume Solicitations and Multiple Providers http://culturalengineer.blogspot.com/2013/12/one-click-micro...