The time when words are no longer considered new or special to the general audience of a media outlet and are therefore written without quotes.
I think Twitter is finally post-quote. Hopefully I'll never read this kind of sentence again:

Jessica Simpson ranted against celebrity ball shaving last week. Her Twitter posts - known as "tweets" - urged Americans to protest the despicable practice.
by someotherguyfromohio2 March 3, 2011
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