I can't read the commenter's state of mind, but the word "forced" seems to be used colloquially/artfully, to portray what they personally and subjectively experience with Facebook, and not meant necessarily as an objective description of Facebook's feature/UI/UX.

From a Facebook designer's point of view, the UI/UX most surely is intended to be "encouraging". But it may also be the case that for some users, the social dynamic may feel particularly oppressive.