[TYPO3-english] tt_news subhead/bodytext into meta description field?

[Douglas La Farge]

If you paste a url into facebook to share it in facebook it grabs meta
data from the page.  with typo3 pages it's grabbing the site wide
description

we do not want to populate the description field for each news article.
we'd like a way to automate populating meta description= from the bodytext
of the article so that when facebook gets the meta description from typo3
something useful is returned.

does anyone have any suggestions on how to approach this problem.

regards,
doug