Mention/Reply to users in comments using @ (@name) I am looking for a feature that makes it possible to reply to comments, or mention users in a comment using the @ symbol.

So, if I was to write the following in a comment on a node:


  @Michael Jackson Cool stuff dude.


"@Michael Jackson" would turn in to a link that leads to his user page.

Also, if it is possible without to much hassle, it would be great if it only turned in to a link if the user exists, to prevent a 404 error.

Thanks.
I think you might be looking for this module but the 7 version is still in dev.

Mentions


  The Mentions module offers Twitter like functionality, recording all
  references to a user's username - using the [@username] or [@#uid]
  filter format - from various locations, providing a centralized page
  to track all mentions.