[dragonrancher]

It's an unfortunate side effect of the "flash crowd" and "Slashdot effect" articles being merged in the past. The editors at the time decided the terms were synonymous, but "Slashdot effect" won out as the dominant title. The "1970s neologisms" category tag must have come from the "flash crowd" article.

[fsckboy]

it must be the "Wikipedia effect", because the term was "flash mob"

[nine_k]

Flash mob (2003) is newer than Slashdot(199x).

https://en.m.wikipedia.org/wiki/Flash_mob

[ZeroGravitas]

https://en.wikipedia.org/wiki/Flash_Crowd

[KnobbleMcKnees]

If you read the second paragraph of the Wikipedia page for "slashdot effect" you'll see that the term was, in fact, "flash crowd".