Multiple Blogs

I’m interested to set up a site selling t-shirts online.
I intend to let buyers to upload their pictures ( of them
wearing our tees) to share with friends. They can sign up,
upload pictures and get people’s comment. Just like a blog
feature. I don’t know if WordPress MU can let me do this.
Take a look at https://www.threadless.com, they’re doing this on
their site.