A perfect domain for the teenage market, combined with the word "tag" which could signify hashtags (like on Twitter), personal identify (your "tag"), or exchange from one to another (to play "tag").
Teentag has seven letters and only two syllables. Two-syllable names are very rare and highly prestigious. Leading companies using two syllable names include Gillette, Dropbox and Buffer.
This domain was first registered in September 2004. Older domains have an advantage when ranking in search engines.