For Facebook and typical online sharing, megapixel count is usually not the limiting factor. One community answer notes that Facebook-sized display images can be around 720×540 pixels, which is only about one-third of a megapixel, so almost any modern smartphone has more than enough resolution.

A practical baseline from the answers is that a 5MP smartphone camera can be good enough for everyday use. But megapixels alone do not determine photo quality. Lens quality, sensor size, image processing, focus performance, and low-light capability often matter more than the raw MP number.

So if your goal is "good" everyday photos for social media, don’t choose based on megapixels alone. Instead, compare actual sample photos from the phones you’re considering and look at how they perform in real-world conditions, especially indoors and in lower light.