Here’s an example of how a comment by Robert Scoble on TechCrunh was viewed earlier:
This comment was found by Google in the following manner:
Not just this, you can even put in all the details of the persons whose comments you wish to see, for example, “commenter name * commenter title” ( “Robert Scoble * Chief Learning Officer at Rackspace”) and all comments given by that person on all sites will be made available.
Google, however, is unlikely to pass the information about who is checking your comments to the commenter. Now, the comment text is a part of the page content itself so if you have made any profane or ugly comments any where then you may fall in to some trouble as per the Google’s Webmaster Guidelines.