Quite a high percentage of the people in the world without internet access live under governments with poor human rights records. In this new age of massive unscrupulous spying and data mining by governments, bringing the internet to new populations without making sure they understand the risks makes them vulnerable to unprecedented levels of tyranny.
Any initiative that tries to expand internet access without addressing these basic moral issues is suspect, and we obviously aren't going to see responsible behavior on this front from the likes of Facebook.