Chris Borland Retires from 49ers: Twitter Reacts to LB Retiring from NFL at 24

There was some surprising news in the NFL on Monday evening that will have immediate repercussions for the San Francisco 49ers and could have a bigger impact on the league as a whole.

Mark Fainaru-Wada and Steve Fainaru of ESPN.com reported that 49ers linebacker Chris Borland, who was a rookie last season and is only 24 years old, elected to retire because of concerns about his long-term health and head trauma.

Borland commented on the decision to Outside the Lines, via Fainaru-Wada and Fainaru:

"

I just honestly want to do what's best for my health. From what I've researched and what I've experienced, I don't think it's worth the risk.

I feel largely the same, as sharp as I've ever been. For me it's wanting to be proactive. I'm concerned that if you wait till you have symptoms, it's too late. ... There are a lot of unknowns. I can't claim that X will happen. I just want to live a long healthy life, and I don't want to have any neurological diseases or die younger than I would otherwise.

"

Naturally, Twitter reacted to the breaking news Monday.

Grant Paulsen of 106.7 The Fan in Washington, D.C., noted that this is becoming something of a trend in the league:

SportsCenter shared all the attrition on the 49ers defense from just this offseason alone:

KNBR-AM's Dieter Kurtenbach passed along the official statement from the team:

Dane Brugler of CBS Sports pointed out how Borland’s love of the game, or lack thereof, is certainly not why he made this decision:

Borland's head coach during his tenure with the 49ers, Jim Harbaugh, supported his decision: 

Former player Donte Stallworth weighed in with an interesting perspective, while current St. Louis Rams defensive end Chris Long praised his fellow NFC West participant:

"

WOW. I loved Chris Borland's game but I can't fault him for calling it quits. His concerns are real. Still it takes a man to do the logical.

— Chris Long (@JOEL9ONE) March 17, 2015"

New York Giants guard Geoff Schwartz also commented on the development from a player’s perspective:

One of Borland's former teammates at Wisconsin, Kevin Zeitler, wished him the best, while Indianapolis Colts long snapper Matt Overton understood what Borland's move meant:

Seattle Seahawks quarterback Russell Wilson also weighed in as both a past teammate and a division rival:

San Francisco cornerback Tramaine Brock and Seattle linebacker Bobby Wagner also commented on Borland, although they took very different stances:

"

No offense to anyone but I'm playing until I can't anymore. I love this game to much.

— Bobby Wagner (@Bwagz54) March 17, 2015"

Another fellow former teammate Alfonso Smith added:

This move certainly drew some attention because head injuries have become an increasingly significant concern with football and the NFL in recent years. Doug Farrar of Sports Illustrated pointed that out:

Michael Silver of NFL.com urged 49ers fans to understand that this move was about more than just their favorite team:

Nathan Fenno of the Los Angeles Times also took a more macro approach when analyzing Borland’s decision, as did Tyler Dunne of the Milwaukee Journal Sentinel:

Jim Rome noted that this move will catch the attention of the front offices of both the 49ers and the league as a whole:

While it is easy to sit back and guess what the impact on the league will be if more young players continue to retire, ESPN's Bomani Jones provided an intriguing counterpoint:

As for what’s next for Borland, Bleacher Report’s Matt Miller had a potential answer:

Per Pro-Football-Reference, Borland played 14 games in his one season for the 49ers and tallied 107 tackles, two interceptions and a sack. He was an up-and-coming contributor on the defense and likely would have seen serious playing time this year after Patrick Willis retired. But he clearly felt his long-term health was more important than that. 

Regardless of what Borland does now that he's retired, it was certainly a bold move that captured headlines for a number of reasons.