follower
Definition:
A follower is someone who subscribes to your content on a social network such as Twitter. The more followers you have, the more people that hear what you have to say.
Here's a word you may not know...
podcast
The word podcast is a combination of iPod and broadcast. As the name suggests, podcasts are audio or video broadcasts that you can play on your computer, iPod or any other mp3 player. The ability to subscribe to an audio or video broadcast and regularly receive new episodes is what separates a podcast from a standard audio file.