What is “it”? Webmentions? Webmentions can be sent from anywhere, not just places you’re actively monitoring. They can be used for example to create a comments section on your blog which amalgamates comments from various syndication points.
That is, you post to your blog, you post a link to your blog post to twitter/Facebook/lemmy etc, and comments or replies from any of those can show up on your blog itself if you so choose.
Any suggestions on where to order lenses from?