Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
@evan @maj But Bob may want to reply something that he doesn't want to divulge to all of Alice's followers (he likely doesn't know them all) so he may want to explicitly shrink the set to the intersection
