In the original Dawkins sense of the word, this is explicitly so. Strictly speaking, memes are just ideas that use us to replicate. A worldview is an idea. Pogrom ergo sum, so to speak.
Exactly. Spreading and replicating like viruses across host bodies. And just like certain viruses, some can stay dormant for years, never fully going away - e.g. "The Game" (sorry not sorry). :p
More like a fiction tale that people take seriously. But also, maybe a meme in the original meaning of the word, before it became funny internet pictures
I had both Dawkin's definition and internet memes in mind as I wrote this, since I don't think they're so different in the end. A meme (even in the modern sense) doesn't have to be a funny image: In can be a practice, like rickrolling; a text like copypastas, a story -true or fictional, like "operation baja-blast" or creepypastas. Some combine several of these things, like the meme "loss.jpg" contains the comic's story, it's pannels, and the behaviour of hiding the loss symbol or finding it. All of these things are also what religions are made off!