How to get a list of pages with similar content to the currently viewed page

Question

Browsers

I have a "similarsites.com" button in Chrome and a "Google Similar Pages beta (by Google)" button - they help me a lot when traveling the web by giving a list of similar pages to the current site.

But they have such a drawback :
- in LiveJournal or VK or anywhere on the platform, if you press the button, a list of similar platforms will appear (which is logical), but I want a list of similar key topics to the current blog post or similar to what is written by a person in microblog.

That is, I'm wondering what service can analyze the content of the currently viewed page and issue a list of similar (by keywords?) pages. very good if in Russian and with a button for chrome.

Answer 1

found issuance of similar content from advertisers on their sites\products :) but where is it for everything?