anatomy of internet plagiarism

I saw this headline on Huffington Post this morning:

• Tina Fey Dusts Off Her Sarah Palin Impression On Letterman (VIDEO): Posted: 11- 4-10 09:47 AM.

This afternoon, I see this headline on The Daily Dish:

• Tina Fey Dusts Off Her Palin Impression: Posted 04 NOV 2010 01:47 PM

My curiosity piqued, I followed the link to the CBS site, which has this as a caption for the video:

• What's new with Sarah Palin? Tina Fey dusts off her impression for a midterm election update: no post time listed

Is this minor? Sure. Is this trivial? Sure. It's the innerwebz, whaddaya expect!