Yahoo is revving up the competition against social networking sites with Mash, which launched today in a limited public trial mode.

Unlike Yahoo's previous stab at social networking -- Yahoo 360 -- Mash does not integrate with other Yahoo applications like Flickr or Yahoo Music Unlimited. However the company says it will introduce widgets over time that will incorporate those features. At present, Mash is not very much focused on music or videos.

It does have one interesting twist in that it allows users to edit their friends' profiles, wiki-style.