microblogging.org is a new microblogging community site based on wordpress mu and buddypress, it´s very simply to create a username and start your own blog on a .microblogs.org subdomain. it´s also possible to add/map your own domainname to your microblogs.org blog.
microblogs.org is 100% free for use
Cuéntanos a qué tipo de público quieres llegar
all logo designers and webdesigners with good ideas ;-)
have a look at microblogs.org, logo should fit to the site and colour scheme, should be a facebook-like logo (no, no copy), clean design, it should also be possible to create a icon-logo of it (see upper left corner of microblogs.org)
+ you have to provide a layered .psd file, a .jpg version and the favicon.ico (if you designed one)