An alloy is a mixture of chemical elements, which forms an impure substance that has the characteristics of a metal. Alloys are made by mixing two or more elements; at least one of which being a metal. This is usually called the primary metal or the base metal, and the name of this metal may also be the name of the alloy. The other constituents may or may not be metals but, when mixed with the molten base, they will be soluble, dissolving into the mixture.
I was playing with the idea of using the idea of alloy as a metaphor for describing YouTube activity.