Billboard and Twitter team up to create a chart based on Twitter data measuring real-time conversation about music.

Each year, TIME selects one person who has most affected the news of our lives in the past year. Since the magazine’s first selection of Charles Lindbergh as 1927’s Man of the Year, this special issue has become an annual tradition.

This year, in the weeks leading up to the Person of the Year announcement, Twitter and TIME are teaming up to spark a global conversation around who you think should be chosen.

Twitter is already a companion for live experiences, bringing people closer to the moments and events that matter to them. Now media outlets are using Twitter to take people back in time to a moment that changed the course of history.

To mark the 50th anniversary of the assassination of President John F. Kennedy, you may see a steady stream on Twitter recounting historical moments starting today through Nov, 25, which was the date of Kennedy’s funeral. Here are the Twitter accounts to follow to go back in time:

People from around the world joined Japan on Twitter to celebrate Tokyo’s winning bid for the 2020 Summer Olympic and Paralympic Games.

The 50th anniversary of the March on Washington was commemorated on Twitter.