I hate Facebook. For its user tracking practices, their attention hacking, and their UX is terrible too. I only use Facebook because others post events on it, and I can't convince these people to use open alternatives.

How can you feel proud about such a product?

PS: Yesterday I got an email from Facebook saying that I had 4 messages waiting for me. I opened the app, it showed a little balloon with "4" in it. I clicked it, and there were no messages ... sigh.