There are many sites where in you can put your blog, each blogging platform like WordPress, Typepad, Blogger has its own log in system and then there are cross platform commenting system like Disqus and JS-Kit.

Disqus is a powerful comment system that easily enhances the discussion on websites. While JS-Kit services let web publishers build dynamic, compelling online experiences in just minutes.

TechCrunch is already using FB Connect for leaving a comment in their site and it is almost 20 percent of their comments. Facebook Connect is already available for more than 500,000 blogs and sites that use JS-Kit commenting widgrt and Disqus is also planning on implementing Facebook Connect by the end of the year.

While some are still connecting with Google’s Friend Connect which lets people log in with different credentials or even Twitter. JS-Kit is also working on adding Friend Connect same thing with MySpace ID as log in options. Any of this choice will work a great as what you want but there is an exception there are already six different log in option in JS-Kit widget namely Guest, Existing JS-Kit, New JS-Kit, Haloscan, OpenID, FB Connect.

For more details about this news visit Techcrunch.