Evolution affects humans too.

I present to you 5 facts.

1: Civilisation started after early homosapiens migrated from Africa into hostile ice age Europe.
2: Adaptions occur more frequently when an animal enters a new environment.
3: By far the most important adaption in recent human evolution is the brain. A neanderthal with a human brain would not be significantly worse or better off than a human.
4: Physical adaptions take longer to evolve than the simple increase in size of the neo-cortex.
5: Humans do have a plethora of physical adaptions to various environments.

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Limited resources implies a selective pressure. In fact, it could be argued that there is no such thing as 'unlimited resources', so the only real requirements for evolution would be replication and mutation.

How does a fit meme help its carrier survive?
How is that relevant for the question of whether memes can evolve? The carriers are only the environment for the memes, like oceans are for fish. And 'fitness' isn't something you define, it is implicit in the mechanics of the environment. Isn't the chance of selection essentially by definition related to the fitness?