Gormley: Social media limits on free speech necessary, but murky

However universal we claim them to be, every democracy sets limits on the very rights that its constitution declares inalienable.
Many of these limits on democratic rights seem arbitrary. Boundaries often do; still, we largely respect them. We know, for example, that an ill-informed 18-year-old may have a lesser ability to vote than a well-informed 17 1/2-year-old, yet we understand it is sensible to have a voting age limit. So while we bicker about precisely which age limit is most appropriate,