The Missing People charity posted an appeal for Marina, 22, saying she has not been seen since July 31 after going missing from her Haringey, north London home, having last uploaded to her channel ten days previously.
Several hours later, her boyfriend, Brandon Mehmed, also a YouTuber, tweeted: "Everything is being dealt with in a professional manner". However, the police in London reported that the YouTuber was officially missing.
Joyce returned to YouTube a year later to explain what really happened with #savemarinajoyce, claiming she was struggling with serious depression at the time, which was causing her unusual behaviour.
The video titled, "Date Outfit Ideas" saw Ms Joyce at one point appear to whisper, "help me" very quietly.
Listen to Newsbeat live at 12:45 and 17:45 weekdays - or listen back here. The caption said that another video would be posted the following Thursday, however it never was.
No Man’s Sky Beyond multiplayer Nexus revealed as launch trailer lands
When we made No Man's Sky , we always wanted it to feel like you had stepped into the cover of a science fiction novel. When we sat down to write those first lines of code I could never have imagined the kind of trailer we just recorded.
International Monetary Fund contradicts Trump: China hasn't manipulated its currency
China's currency "should remain flexible and market-determined", which would mean "less intervention", he told reporters. So far, China has argued that the fluctuation in the yuan exchange rate is due to market forces.
18 dead, 14 missing after super typhoon slams China
China issued a red alert along the coast - the most serious of its four possible typhoon warnings - before the storm arrived. The river blocked by a landslide rose to a level of 10 metres within 10 minutes, trapping 120 villagers, Xinhua said.
Speculation, rumor-mongering, and conspiracy theories flourished on social media after she posted a makeup tutorial video in October 2016.
Britney's controversy began shortly after she canceled her Las Vegas residency as well. She finally admitted in March 2017 (see video below) that she suffered a bout of depression.
After the news went viral, two of her friends took to social media to claim that she was safe, but police could not immediately confirm that. "It hurts me to this day to think of all the reckless things I did that showed that I did not care about my life".
At the time, the hashtag #SaveMarinaJoyce trended worldwide.
"Marina wants to make a video soon explaining all of this because it became a bit too much what with everyone thinking I'm a suspect and all".