What is a Hash Card?
A Hash Card is a unique feature in Carbon that allows you to open up a new webOS card for a hashtag in order to follow that hashtag in a dedicated timeline. Apart from viewing tweets with a chosen hashtag if you open a Compose screen using the Hashcard it will automatically add the hashtag to your tweet.
You can open as many Hash Cards as you want.
To create/open a new Hash Card go to Carbon application menu and choose #hashcard. Once you see the Hash Card dialog enter the hashtag that you want to follow and the frequency for the hash card to update/refresh it for you. That's it. Next time you follow an event or participate in an even don't forget to use the Hash Card.