Hari Ok here is the review! I have tested shareholic related posts, basically, it is from
yet another related post plugin authors where wp plugin offers free related post
shareholic shows related posts (discussions) without any deep integration, they crawl our site and shows related posts. in addition, they do consider google analytics to show the most relevant and most visit length pages under the discussion.
They do have an integration for phpBB but when I tried with flarum it is completely broken.
i thought it would be a nice addition to small forums, but their related post service is a completely paid service.
if you still want to test you need to install HTML head extension by ianm and add shareholic code
and also you need to add a related code
div in the appearance > footer.