Mathis' decision to retire generated plenty of social media reaction from around the NFL:
NFL players weigh in on CFP Semifinal matchups
The College Football Playoff Semifinals are in the books, and we now know it'll be No. 1 seed LSU facing No. 3 seed Clemson in January. Here are reactions from NFL players about Saturday's games.
Patriots fans, players celebrate at Super Bowl parade
Hundreds of thousands gathered in downtown Boston on Tuesday afternoon to celebrate with the New England Patriots at the Super Bowl parade.
NFL community honors legacy of Martin Luther King Jr.
NFL players and teams took to social media on Monday to honor the life and legacy of civil rights activist Dr. Martin Luther King Jr.
NFL community reacts to stunning Bears-Eagles finish
A stunning finish in the Bears-Eagles capper to Wild Card Weekend left the football world slack-jawed, with nothing but their thumbs to communicate. We collected some of the best reaction.
NFL community reacts to college football's rivalries
Saturday of rivalry week was made for intense play and equally passionate reactions. It's no surprise then that NFL players past and present were in front of their screens to watch the action.
NFL community reacts to Bryant signing with Saints
NFL players past and present reacted to the news of Dez Bryant's signing with the New Orleans Saints on Wednesday, sending their congratulations via social media. We collected the best reaction.
NFL community celebrates Mother's Day
Get out the pancake batter, fresh-squeezed juice and flowers -- we have mothers to thank. The NFL community did its part Sunday, thanking the ever-important mothers via social media.
NFL community reacts to Jason Witten's retirement
See how players and coaches from around the league responded to Dallas Cowboys legend Jason Witten calling it a career on Thursday.
NFL community reacts to Shaquem Griffin draft pick
The Seattle Seahawks added another Griffin to their roster in the fifth round Saturday, drafting Shaquill Griffin's brother, Shaquem Griffin.
Jacksonville Jaguars unveil new old-school look
The Jacksonville Jaguars led the Nike uniform revolution five years ago with a unique, somewhat controversial look, capped by a two-toned helmet. Say goodbye to excess, Jacksonville.
Miami Dolphins unveil updated, simpler uniforms
We're operating in an age of excess when it comes to football uniforms, but there's hope for the minimalist faction: Better days might be ahead. The Miami Dolphins stated as much with their new duds.