This biggest viewed song "Despacito" just hacked & removed by a Hacker named Prosox and with Team. This song reached 5 Billion on 8th April and just hacked on 10th of April. When hacked the song Title was changed & Thumbnail was changed. But now it's back online. We don't think so that it's because of YouTube(Google) server vulnerability because they have very high-security servers. We think that this is done through user-end control.