[FilthyAnalyst]

Yes, you will see comments from friends on posts like these. Even if they have a million comments it will come into your feed with a friends replies visible.

[simoneau]

And I think that's why these are so viral. When you see a question and your friend's answer, it makes you feel like you're responding as well.

[input_sh]

That or the post is some variation of "tag someone that does X", or the one I've recently noticed "tag your favourite celebrity and see if they'll respond". Random pages I've no connection to are now popping into my feed because some page I follow responded to someone that tagged them under one of those. Completely pointless.