Serial made its debut in October and just concluded its first season.

'The Newsroom's Creator Pays Homage To Mentor Robert Whitehead Through Series Finale

The podcast as noted on its website followed, "one story - a true story - over the course of a whole season."

Since the spin-off of radio program This American Life began it has garnered much attention. The Guardian reported today, Dec. 18, that Serial broke an Apple record. 

'The Newsroom's Creator Talks About That Finale

Episodes of the podcast have been downloaded and streamed more than 5 million times from Apple's iTunes store.

Apple claimed this podcast is the fastest podcast to reach 5 million downloads and streams in iTunes' history.

Serial concluded its first season this morning. The season focused on the story of killed 17-year-old Hae Min Lee. Serial's host Sarah Koenig took listeners through the 1999 murder mystery week-by-week, ending with 12 episodes in all.

Koenig first learned about this case more than a year ago and in Season 1 of Serial she's looking for answers about Lee's death.

In the final episode, What We Know, of the season she left listeners asking more questions.

Check out some of the best reactions on Twitter below.

Twitter user MatteFinished made an interesting remark about playing the finale backwards.

Gemma Arrowsmith is urging Koenig to do a special when the DNA results come in.

Actor Zach Braff posed the question Wednesday, wondering if Best Buy is responsible.

Bruno Pieroni had mixed feelings about the finale.

Funny Or Die parodied the finale.

What did you think of Serial's finale?

Tags: Serial Podcast