Oh yeah. Memes. Most people in the scientific community don't give it much credence yet. The guy who does these videos is really obsessed with stuff like the Singularity. I read a great counter manifesto the other day, which I've linked at the bottom.
The problem with saying ideas are viruses is the same with confusing any metaphor with actual reality. Ideas aren't bugs that infect us. We take them in, deliberate them, and assess how they make us feel. We even create them.
A major issue I can see with the meme metaphor is that by treating ideas like diseases, it may be possible to persuade more people to get behind banning or greatly curtailing free speech. It's about deception, or in other words, it's a power game. Scroll down toward the bottom of the linked page for the manifesto. It goes into a lot more detail than a brief, disconnected Youtube comment ever could.http://edge.org/conversation/one-half-a-manifesto