Memes, Phonemes, and Morphemes

Although meme sounded familiar I had to look it up in Wikipedia (A meme (pronounced /ˈmiːm/, rhyming with "cream"[1]) is a postulated unit of cultural ideas...).

Then I remembered classes in linguistics and discussions on phonemes and morphemes from years ago: units of segmental sound and units of semantic meaning, respectively.

Since we're discussing "units of thought" what would we call the building blocks of all Internet search activity? I suppose the phrase "keyword" is a start.

I can only imagine that Richard Dawkins who introduced the term "meme" in 1976 spent some time either in linguistic classes or nearby taverns where linguists drank a little and discussed language.