Update 02/10/2019:

Previously, it was reported that Young Busco-- the creator of the "What are those?" meme passed away at 31. Now, the cause of his death was revealed to be an accidental overdose. 

According to the Contra Costa County coroner’s report obtained by TMZ, Young Busco ingested a variety of drugs that included ecstasy, cocaine, morphine, codeine, and methamphetamines. The coroner said his blood tested positive for all of those substances mentioned. The report also noted his wife told police that he drank and may have taken cocaine the night before he passed away. His death was listed as an accidental overdose.

source: TMZ

Original 11/26/2018:

Young Busco, best known for creating the insanely popular "What are those?" Vine video that turned into a worldwide meme, has reportedly passed away at 31. Details surrounding the death of Young Busco, real name Brandon Moore, are still unknown at this time but his death was reported by Bay Area news reporter Melissa Colorado. 

Young Busco's 2015 video quickly spread online, racking up 38 million views and it also spawned a scene in Black Panther, which the social media personality wasn't a fan of.

Young Busco reacted to the Black Panther scene by telling HuffPost, When I saw [the scene], my girl was trying to record it. I slapped the phone out of her hand, because I was like, ‘I don’t want to fucking be a part of this.’ For real, every time I see that shit, I get depressed. ... I feel good I created something that’ll be with the world forever, but then I feel bad because I didn’t handle my business part correctly." 

Young Busco, who was a father to five children, continued to post his comedy on Instagram and had posted on his page yesterday (November 25). 

Source: The Fader