Just this week News Corp chief Rupert Murdoch admitted that his media empire had made some “big mistakes” since purchasing the once leading social network MySpace.

Here's another one of those “big mistakes.”

If one were going to break big news on a social network, wouldn't it be a good idea to break said news on one's own struggling social network rather than promoting another rival network?

Not so, at least when it comes to News Corp's Wall Street Journal. The New York Observer's Media Mob blog reports:

When Times Square was evacuated earlier this afternoon, The Wall Street Journal “checked in” to the area on Foursquare with a news alert: “Portions of Times Square have been evacuated after a report of a suspicious package.”

This was the first time the Journal has used FourSquare to break news, according to a release.

The Journal even put out a press release. A press release! It could have just as easily said, “Sorry MySpace, even your own sister-companies don't find you relevant.”