Simler, a fledgling interest-based social network, which I covered in early September (See: Find Similar People and Interests With Simler's Microblogging Platform) is now open to the public and no longer requires invites. You can find my account at: http://simler.com/user/louisgray/.Simler lets you set up new discussons around tags, and like other real-time services, discussions on specific topics bump them to the top. Check it out if you don't already have a login.