Help for UGC website

[Teena12]

Hello

I just need someone to more or less point me in the right direction.

What I want to accomplish is a website with a user generated blog (not one per user but each will have a profile and post in one common blog-like structure). There will also need to be present a very thorough & detailed search for readers. So say a user wants green & sqaure & the search will pull up the entries marked with green, square. So when the user makes a post there needs to be an option of color and shape which will be then visible to the reader and the search will go by that as well. Is there perhaps any ready made program/service that might have such options, or what should I be looking into?

Thank you in advance for any tips!

[SB65]

Wordpress, with everyone set up as an 'author' user, use tags on each post, plus a plugin which allows multiple tag searches (say, this one).