Share & XXX will donate... @ facebook. If you really want to donate, just donate!!!
Actually they just want ppl to share their things. And ppl wull be more willing o share if its for charity.
They do this to attract ppl to their FB pages. Since there is a charity drive going on, more ppl will tend to visit their page to find out.
It is part of the business plan. And attraction. And publicity. Its not about donating. But still part of it is abt donating too.