Have just been trying out Yahoo's new social network, Mash. It's in private beta and I managed to get an invite from Mdy through Twitter. If you want to see what it looks like, best take a look at what the first few users have been posting up in the photo pools. My first impression is that it's not as intuitive as, say, Piczo or Bebo. It doesn't offer the skins that most blogging platforms do, like Vox or Wordpress. And it's not as networked as Facebook. I'm wondering what segment of web user Mash will appeal most to.
I'm sure that its best bits will develop over time, but being Yahoo, I thought that from the start maybe more would be made of the niche networks that are under the same roof - like Flickr or Upcoming. You can't even take your profile pic from your Flickr account.
So let's see what happens over time. If you'd like a Yahoo Mash invite let me know.