This is something that took me years to grok about Twitter. Each tweet creates a forum that is solely moderated by the tweeter. Mod powers include blocking peop

This is something that took me years to grok about Twitter. Each tweet creates a forum that is solely moderated by the tweeter. Mod powers include blocking people (which removes all their replies from the forum and from any other forum you create in future, as well as blocks them from seeing your tweets), and locking the whole forum (making it read-only except for named people).