What Makes Up the Name: between + teen

One of the biggest groups of netiquette violators are tweens, those painted & Biebered-up not-quite-teenagers who have all of the attitude and a fraction of the hormones of the elders they emulate. They also seem to have more buying power than South Korea, so everyone is treating them like gold and letting them do whatever they want, which in 15 years is going to turn out great for America.

Origin: We found an advertising reference to tweens from a 1988 NYT piece suggesting it's been a marketing demo for a lot longer than it's been in the public lexicon.