I always believed figuratively it has the wrong name but technically it has the perfect name.
Technically in the computer world a virus is a piece of code that attaches itself to another piece of executable code.
In the real word technically has translated to: a virus is a piece of destructive code that attaches itself to another piece of executable code
In less computer light, something destructive connected to something that was useful without the destructive bit attached to it.
Now with viral marketing, they hope the first virus definition holds water and not the real world example. Hence meaning, something sent on to you via a useful (reliable) source and adds to the original experience.
Truthfully, if someone told someone else, I got a virus, it is seen as a bad thing.
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