(AP) — The Washington Post Co. is putting Newsweek up for sale in hopes that another owner can figure out how to stem losses at the 77-year-old weekly magazine.  While magazines in general have struggled with steep declines in advertising revenue because of the recession, news magazines such as Newsweek face the added pressures from up-to-the-second online news. Once handy digests of the week’s events, they have been assailed by competitors on the Web that pump out a constant stream of news and commentary.

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