It's ironic how one can hold utmost respect for Facebook's libraries, but be vehemently against the actual Facebook web application and their business practices.
Those drug addict musicians that track your every move online, sell your data, make billions from advertising, influence elections. Totally "not at all different".
I like the analogy. Sorta offtopic, but I was thinking about how morally falsy it is to buy albums of those artists, because well, most likely a big part of the revenue will be spent on drugs and on continuing that lifestyle.
Just because you don't like something doesn't mean you think it is immoral.
For example, many people against Facebook simply want to be in better control of their online identities, and have privacy. I am in this boat. I don't think Facebook is 'evil', or sharing my data with 3rd parties is a 'sin'; I just think society would be better off if privacy of this kind were more strongly controlled by individual choice, rather than the whim of a corporation.
Programmers should consider the implications of their actions. Using Facebook's libraries support Facebook. If you don't want to support Facebook, you should prefer alternatives to their libraries whenever possible.
They benefit from other developers using it or they wouldn’t go through the trouble of making it accessible outside of the company.
Access to good talent runs try. Maybe you grow a team of highly talented developers using Facebook’s stack. Facebook is more capable of recruiting them since they’re already familiar with some of Facebook’s stack.
There are interesting reasons why companies expend a lot of resources on free stuff for programmers. If it didn't have a beneficial effect, they wouldn't do it.
Are you sure this move isn't just a business practice we're all too stupid to realize we should be against? I'm not. I'm not touching it. Maybe if it goes GPL.