Watch ‘The Year With Katie Couric’ Online

“The Year With Katie Couric” — a collaboration between “20/20″ and People magazine — reviewed all of 2012, from the biggest news stories like Newtown and Sandy to guilty pleasures like “Gangnam Style” and “Call Me Maybe.” Celebrity marriage, breakups and babies — and feuds — also made appearances. Social media’s effect on politics and pop culture was another focus.

Watch all these stories and more by clicking on the videos below.

Celebrity Romance — Jennifer Aniston and Justin Theroux got engaged; Tom and Katie split; Jessica Simpson had a baby. Here, the weddings, babies and breakups of 2012.

Dishonor Roll — John Edwards, Lance Armstrong and David Petraeus made headlines for all the wrong reasons. Celebrities who appeared in mugshots, not vanity shots, included Shaun White and Lindsay Lohan.

Social Media — In 2012, if it was worth talking about, it was worth tweeting about (mostly).

Guilty Pleasures — “Gangnam Style,” “Fifty Shades of Grey,” “Call Me Maybe” and Honey Boo Boo were on everyone’s minds, lips and screens in 2012.

Newsmakers — Newtown and Sandy topped the list of emotional breaking-news stories of 2012.

The Year in Royals — From the skydiving Queen to Prince Charles doing the weather, the royals cut a new image in 2012.

Feuds — Mariah Carey vs. Nicky Minaj, Chris Brown vs. Drake, and Michael Bloomberg vs. soda.

The Year in Politics — With Biden’s mouth, Ryan’s muscles and Romney’s hair, 2012 proved politics can be fun.

People We Lost — Remembering Whitney Houston, Neil Armstrong and others who left us in 2012.