Yahoo's way of Social Networking: "Y! Mash"

Yahoo's rumored social network, dubbed "Mash," has arrived. The company started inviting people outside the company to test it on Friday, the company says in a blog.

Mash is different from other social networks in that you can start profiles for your friends and "open" your own profile to friends you trust, according to the Mash blog. What that means, exactly, is still a bit unclear.

You can also reportedly customize your profile or friends' profiles with other apps, ala Facebook.

"One last note before you jump in: Mash is still pretty raw--there are bugs and we haven't gotten to several of the features it really should have. We need to hear from you about where to focus our efforts," writes Will Aldrich, the head of Mash.

No word on what will happen to Yahoo 360, a social networking service that never really caught on, leaving Yahoo executives to acknowledge that they had some catching up to do.