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Perhaps when we find some time we should publish some "updated" statistics about the commentosphere.
The issue with comment RSS feeds is that they are limited in size (number of items) and if you have a blog with lots of comment activity, an index server will need to scan the feed very frequently to get all comments: considering the number of sites with commenting, this will endup being an issue.
Please note that coComment does not index only comments from our users: we also get all the comments from the conversations that our users track + all comments from integrated blogs.
@clemoine Thanks for the clarification about coComment. My bad. What I couldn't figure out is how I can search the comments that are indexed for keywords or phrases -- it looks like search by tags is as close as it gets.
Didn't know Comments RSS were limited (and I think Blog Posts RSS are probably limited too). That being the case, would it be as simple as a "ping" from the blog comment feed as needed, e.g. if the limit is 50 comments, a ping every 50 comments.
The issue with the ping is that it is treated asynchronously: this mean that if you get some comments between the ping and when the server actually get the feed, some might be lost. But, this said, it will probably work for most blogs, but will not be 100% reliable.
With blog posts it is not too much an issue as the update frequency is lower (except if you post very very frequently ;-) )
Christophe.