There are over 500 million tweets sent from around the world every day. Because Twitter has become such a major source for global news and conversations, we pull weekly Twitter trends to discover what the world is talking about. Here are some of the highlights:

Game of Thrones

If you’ve been on Twitter this week, you know that the talk is all about Game of Thrones. HBO announced that the show has been renewed for fifth and sixth seasons (could anyone else see that coming?). The show began its fourth season on Sunday night, and came out with record ratings, debuting at 6.6 million viewers. Creator David Benioff has described season four as “the pivotal point” in the series. While the kick off to season four was a massive success, it wouldn’t be a true premier night without a hiccup. HBO Go turned out to be that hiccup on Sunday night. HBO acknowledged that HBO Go was down on it’s Twitter account after users started sending messages that they were getting an error on the site.

“Looks like there’s trouble in the realm. Apologies for the inconvenience. We’ll be providing updates, so please stay tuned. #GameofThrones,” tweeted HBO. While #GOT fans discussed the HBO site crashing (at the worst time possible) on Twitter, they also shared predictions, opinions and their excitement for the second episode.

Ultimate Warrior

After making appearances at WWE events over the weekend and showing up for Monday Night Raw, Jim Hellwig – also known as the Ultimate Warrior – passed away on Tuesday night. While the Hellwig and the WWE had some bitterness towards each other, he was inducted into the WWE’s Hall of Fame last weekend. The night before his death, he delivered one haunting monologue:

Colbert to take over the Late Show

Colbert will be leaving Comedy Central as he ends his own show, The Colbert Report, and will be taking over the Late Show from David Letterman. Twitterers are wondering, is Colbert going to keep his ultra-con persona alive? At the moment, it doesn’t seem likely. Colbert definitely brings a whole new audience to the show as he takes over from Letterman, part of that audience being the 6.2 million followers he has on his Twitter account.

The Masters

The 2014 Masters are underway this week at the Augusta National Golf Club and is one of the major championships in professional golf. Bill Haas is in the top position at the moment, with Adam Scott trailing by a stroke. Haas, who attended the Masters for years to watch his father compete, set the pace with a 68 that included a birdie at the 18th hole. Twitterers are excited for it to be back, and for many, start the 2014 golf season.

Stabbing at PA High School

A 16-year old students weilding two knives went on a stabbing spree at his high school in Pennsylvania on Wednesday, wounding 22 people before being tackled by an assistant principal. The student was described by others as a quiet boy who mostly kept to himself, but will now be charged as an adult and will face four counts of homicide and 21 counts of aggravated assault.

Perhaps the weirdest part of the story came after the fact, when one of the stabbing victims — the teen many people are calling a hero for pulling the fire alarm which emptied the school — took a selfie from the hospital after receiving treatment for a stab wound.

Heartbleed

Many may have heard of Heartbleed, but are unsure of what exactly it is. The Heartbleed Bug is a software bug which allows an attacker to read the memory of a server, allowing them to take sensitive information. Heartbleed compromised passwords on many of the internet’s most popular sites, including Gmail, Yahoo, Twitter and Facebook. In fact, the Canadian Government shut down several of its websites which may have been affected. What can you do to protect yourself from this bug? Don’t log into accounts from afflicted sites, change all passwords of sensitive accounts, and if you’re really nervous, keep a close eye on any financial statements for the next week.

For HootSuite users: HootSuite’s platform has not been affected by the Heartbleed bug.

Peaches Geldof

Peaches Geldof was an journalist, TV presenter and model who was found dead this week, at the young age of 25. She wrote a column for Mother & Baby Magazine, recently written that she was “happier than ever,” and was an advocate of “attachment parenting” with her sons. Her son Phaedra was by her side at the time of her death, sparking even more messages of grief and sadness for Geldof’s family. Twitterers were shocked and extremely saddened after learning of the young stars death, many explaining that it was just “too soon.”