+1 on FB complaints...
In addition to the crazy randomness of what FB shows you, I'm sick and tired of FB sending me a Notification that someone has replied to a comment I've made, and I click the link and it just takes me to the conversion, and now I'm supposed to FIND my post in a conversation with 1,000 replies, and you only get to see about 20 at a time (and you don't know if your reply was a top level reply or collapsed in some sub-response.
If you can tell me I have a reply, why can't you just take me to the reply???
Unfortunately, for collaboration and getting questions answered, it seems the ease of creating groups in Facebook means that's where the "action" is currently located.