You’ve posed an incredibly difficult and multifaceted question.

The first extremely difficult sub-question could arise in the form of an academic, “ethical theory” question about morality and the use of the word “should” itself—

—but let’s skip over that for everyone’s sake!

But the glaring question/problem that I see, is if one were indeed to decide that they must opt-out of Facebook for reasons of morality, where does it stop?

Should they not also opt out of society?—opt-out of paying taxes to a government that they know to be acting both immorally and irresponsibly?

Please don’t understand that as me knocking your question—it’s compelling, and I often have these thoughts about the things I should and shouldn’t be supporting and why.

But, these sorts of philosophical ponderings often lead me into to that same trap that so many other philosophical questions lead to: namely, they lead to nothing—they completely strip us of our foundations and leave us in a desperate search for what ground there is left to stand on.