What's the ideal amount of users a social media platform should have?

Whatever the critical mass point is that preceeds the influx of normies that slowly rot the platform from the inside out.

Zero.

Whatever that amount was that Facebook reached about a year before it became mandatory for your older relatives, parents and grandparents to join. Like a pre-collapse Myspace amount.

42

a couple hundred k at least

I'd guess 100,000

Users with knowledge who share and help as much as possible. Cattle users few as possible.Ideal amount is 1337