The cost is said to be around $100 million. Personally, I don’t get Foursquare, but if they do, more power to ’em.

Yahoo accounts belonging to foreign journalists have reportedly been hacked, according to this story on Huffington Post. Related: Google access in China disrupted.

You make this video and then TechCrunch picks it up.

It would seem so.

Yahoo Search iPhone App and Yahoo Sketch-a-Search are now at the App Store. (Links open iTunes.) Get more info from the New York Times.

The latest departure from Yahoo is Chief Technologist Sam Pullara. (Not to be confused with a Chief Yahoo.) He leaves to become an Entrepreneur in Residence (EIR) at Benchmark Capital. He follows Ash Patel who followed Joanna Bradford who followed Kristen Cordle.

Recently, Carol Bartz’s executive assistant checked out to join Twitter.  The commute from San Francisco to Sunnyvale might have had something to do with that one. Now her top salesperson is jumping ship quitting, too.  Sales rep Joanna Bradford has left for Demand Media.  Valleywag reports Bartz learned about this by reading the news. Oops. No purple door prizes on the way out for Joanna.

See if you can follow this.  This info c/o Search Engine Land.  They report that Yahoo is going to be the default search on AT&T’s first Android handset, the Motorola Backflip. So you have an Android device, and Android is Google’s deal, with Yahoo search.  Someone’s likely to get a terse memo on that.  Also, T-Mobile has dumped Yahoo as default search on their portal, and replacing them with Google.  My head hurts- does yours?

Carol Bartz, the always loquacious Yahoo CEO, put in some facetime on CNBC, as Yahoo celebrates its 15th birthday. Meanwhile, Kara has a suggestion: why not buy AOL?

Yahoo users will be able to access and update their Twitter feeds from various Yahoo properties including the heavily-trafficked front door. Here’s the standard press release, mwah mwah mwah. (I did steal borrow their headline, though.)