Pretty much everyone has, but that’s not the problem here. What if you don’t really want to give them a unique identification number like that? What if you don’t want them them to know you that well? What if you’re not even planning to use your real name at all.

Back in the old days, you could register an account without giving your phone number. Nowadays, pretty much all the big social medias won’t let you register an account without a number. I guess that’s not a big problem for people who don’t care about privacy, but for me that’s a total deal breaker. This means, that there’s a huge barrier to entry.