Facebook doesn't become a "publisher" by removing user-generated content from its platform. They'll continue to qualify for DMCA Title II's safe harbor provisio

Facebook doesn't become a "publisher" by removing user-generated content from its platform. They'll continue to qualify for DMCA Title II's safe harbor provision as long as they take down copyright infringing material that gets reported to them. Facebook is not required to leave non-infringing material intact to be protected under DMCA Title II.