Yahoo has decided to shut down its social-networking experiment, Yahoo Mash, after launching it a year ago, saying to all members via an email from community manager Matt Warburton reading: Thank you for trying out our Mash Beta service. We hope you had fun with it. Please note that we will shut down Mash on September 29, 2008. As a result, your current profile on Mash will no longer be available."
I’ve used Mash before, and it didn’t add any new features, instead you inviting friends that you created profiles for; and was created to provide a better version of Yahoo 360. Too bad it never caught on.
Source: The Social