BackType, a Y Combinator startup that launched in August, is a sort of "Twitter for comments" that aggregates comments from millions of blogs into a single, searchable, parsable stream.
hey launched a new feature called Alerts that will let users track keywords included in comments on tracked blogs - a sort of Google Alerts for blog comments.
They also launched a new feature called Subscriptions, which allow users to track comments on any blog post. Many blogs already have a built in feature that emails readers when a new comment is left on a post to let them keep up with the discussion. BackType now allows people to duplicate the feature for blogs that don't have it.
They also launched a new feature today called Subscriptions, which allow users to track comments on any blog post.