Alongside of its events, Apple uses an #AppleEvent "hashflag" on Twitter, and after today's announcement, the hashtag has been updated with new artwork reflecting the "Unleashed" event.

Apple uses hashflags to increase event visibility and build hype on social media networks.

Apple has been using custom Twitter hashflags since late last year, and research done by Agency Creative suggests that these custom hashflags can cost up to $1 million?