Free speech versus "compelled attention"

Yesterday's story about a woman who made her Twitter account private because of harassment from men sparked a lot of discussion about how blocking and free speech interact with each other. Here's my $0.02 on the matter:

If you think "free speech" is the right to force others to listen, you actually believe in "compelled attention" #blocktogether

— Cory Doctorow (@doctorow) September 22, 2015

If you think "free speech" is the right to force others to listen, you actually believe in "compelled attention" #blocktogether [@doctorow/Twitter]

(Image: Individual silicone earplug worn at ear with Etymotic Research Filter-element ER-25, Kick the beat, PD)