When receiving individual email notifications from Chatter, it can be difficult to interperet the context of a given response. In particular, when you receive a comment on one of your posts or a comment is made on a post that you have bookmarked.
I post a question or a statement in a given Chatter group such as "Hey everyone, great news, we just closed a big deal at ACME Corp."
Later in the day, I post something in a different group that is completly unrelated, such as "I just passem my Advanced Certification exam"
If any other user response to one of those posts with a comment that simply says "Great Job", I have no context as to wht they are replying to
Suggest that Chatter notifications are expanded to include the original "root" Chatter post as part of the notification email. Ideally this would be included AFTER the actuall update, so that you don't ave to scroll through the entire Chatter post to finally get to the respopnse part.
The same thing should be concistantly apply regardless of if the email notification is related to a response that you made, a group where you are a member or a post that you have bookmarked.