When do you stop reading the previous posts and then add your comment to a thread?
If it's a finished item in pictures, or a cute pet photo - I feel reasonably confident to add a "It's cute, lovely, beautiful. . . " without reading anything more than the first post.
If someone has posted a "what should I do next . . ." type of post - do you read all the way through, or do you jump in right away?
It's 'sort of' funny when about three pages in the original poster has posted the finished item and people are still making suggestions on page 9.