I wouldn’t say that viral videos are memes, they are viral videos. But their content can become a meme, which could be a quote from it or some kind of content shown in a different context.
E.g. the Area51 Naruto runner is a meme, but the report where he appears is not.
That was the original use, but what is it in the modern Internet context?
So, would you agree that viral videos are memes? I wouldn’t.
I wouldn’t say that viral videos are memes, they are viral videos. But their content can become a meme, which could be a quote from it or some kind of content shown in a different context.
E.g. the Area51 Naruto runner is a meme, but the report where he appears is not.