Early Sunday morning, 50 people were killed and at least 53 people were injured at Pulse, a gay nightclub in Orlando. The shooter has been identified as Omar Mateen, an American-born man who pledged his allegiance to ISIS. This mass shooting is now known as the nation’s worst terror attack since the attacks of Sept. 11, 2001.

In his address to the country, President Barack Obama said, "We know enough to say this was an act of terror and act of hate."

After news of the heartbreaking terrorist attack in Orlando broke out, people took to social media to show their support to the victims and the LGBT community and to voice their opinions on gun laws.

The hashtag #LoveIsLove and #OrlandoUnited have been trending on Twitter over the weekend, while Facebook activated Safety Check for the first time in the United States. Here's how leaders in business, tech and culture reacted to the horrific event: