WHAT THE TWEET IS A TWITTER?

Today I heard my cat slave (owner) talking about aplusk on twitter.  Who the tweet is Ashton and why does he want to my mommy...er slave...to follow him? The only tweets I know of are the snacks flying around just outside the sunroom window.  Hmmmm, snacks. Maybe, if I lie on that contraption my cat slave is typing on, she'll have to stop and feed me.