Case Study: The Subways on bln.kr
Here is a photo of that shows The Subways (@thesubways) Twitter follower count over time. Look at the spikes around 11/03 and 11/23. I’ve circled them in green.

These are the days when The Subways uploaded songs to http://bln.kr. The songs were quite popular and spread quickly through Facebook and Twitter. Pretty cool, huh?
Here are the first two songs:
Make It Wit Chu (Acoustic Cover) - http://bln.kr/4E3
In for the Kill (Acoustic Cover) - http://bln.kr/4U8
You can view all songs by The Subways here: http://bln.kr/-thesubways