How do you take ownership of your comments?

Answers so far (and what these services ought to deliver):

• Disqus Profile (full ownership on Disqus enabled sites, claiming authorship on others)
• Intense Debate] (for blog publishers: tightly integrated into the WordPress blogging platform)
• BackType Connect Plugin (for blog publishers: copies comments (that link to one of your posts) to your blog, no matter where they are on the web)
• Gravatar (self-promotion, better visibility)
• Google Sidewiki (adds another layer)
• become a blog publisher

In addition, here are some other services:

• co.mment (conversation tracker)
• coComment (conversation tracker - still alive and kicking?)
• Google Reader: "Like" item action (appreciation feedback)

Convenient solutions for ordinary netizens preferred.

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For your reading pleasure:

Comment ownership is a complex problem. The commenter writes the comment, but the blog owner hosts it. So of course, the blog owner has the right to decide what he agrees to host or not. But the person who wrote the comment might also want to claim some right to his writing once it’s published.
("Who Owns Your Comments?" by Stephanie Booth)

From web app Free Speech Advocate

• Disqus is one of the solutions.

  Free Speech Advocate : that was quick and helpful. thx.

  Free Speech Advocate : Hm. This service seems to require action on both sites of the equation. What if the site owner (where you want to comment on) has never heard of Disqus? ("Disqus Profile makes it easy and fun to post comments on sites using Disqus Comments.")

  Alex : Unfortunately, any service of this kind requires action on both sides.

  thunderror : Disqus has always been really useful!

  Free Speech Advocate : @Alex: Oh yeah? Then this has to change. Thanks anyway.

  neo : @Free Speech Advocate: How should this change?

  Free Speech Advocate : @neo: Do you try to convince me that there is no appropriate solution around yet?

  Alex : @Free Speech Advocate: How? If the site where you post your comment doesn't support your service (be that Disqus or Gravatar or anything else), how do you post it?

  Free Speech Advocate : @Alex: What about a web standard for commenting?

  neo : @Free Speech Advocate: Even then the service needs to implement it. Or it needs to be implemented on the browser level (and remember how long it takes to adapt web standards and how many people still use IE6). The Google Sidewiki is the the most-used solution for this side of the implementation.

  Free Speech Advocate : @neo: A web standard for handling comment ownership would make implementation less of an issue, don't you agree? Google Sidewiki adds a second layer that is visible for Google Sidewiki users alone, and the host is left out.

  neo : @Free Speech Advocate: I'm not sure what you expect by this web standard. Should the host as well as the commenter be allowed to remove comments? I see the issue that it's still not possible to leave comments if the host does not like it because then he just doesn't implement it. As an addition it is very unlikely that this standard reaches a critical mass.
  From Alex

• Intense Debate would be another choice.

  Edit: From what I understand, You need to just take ownership of your comments: Use Gravatar

  You can also create profiles at Intense Debate and Disqus which would let you take ownership

  Free Speech Advocate : Is this service not about publisher's needs?

  thunderror : Well, yes. The closest I could find relevant to your question was http://www.backtype.com/plugins/connect

  thunderror : Edited my answer.
  From thunderror

• Google Sidewiki does what you're looking for, but only other Sidewiki users will see your comments.

  From GoodEnough

• The best (in my opinion) current way (excluding a new web standard) is to use your own self-hosted blog.

  Lets take for example this question and I wanted to make a comment so neither the site owner nor moderators can modify or delete my comment.

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  phwd's blog

  [Start]

  Title

  How do you take ownership of your comments?

  Body

  Intense Debate] (for blog publishers: tightly integrated into the WordPress blogging platform)

  This guy is interested in unicorns.[This is my comment]

  Copyright ©2005-2010 Pho Ward

  [End]

  ---

  Now notice here this would be my entire page from the blog title, heading, body and copyright information at the end. I have not included a comment section. [I have also added the same comment to WebApps as well to compare]

  If Webapps does not have some terms such as "I own your comments" then I should have every right to ask for removal of my comment (or no modification). Now lets say a couple months passed and I want to retrieve the comment I made (it holds valuable information to me), but WebApps is out of service or has experienced a database loss. Who is to blame ? Does right of commenting extend to right of existence ?

  Now adding in my solution, as long as search engines are crawling my content, my comment is as viewable as the post itself and untouchable by the WebApps. Maybe not the same ranking but still visible.

  A good example of this implementation is http://daringfireball.net/

  From phwd