"A post from a week ago may be old news in your circumscribed universe, but to those of us who *think*, perhaps we have other uses? Y'know, reference or something? Have you ever heard of the concept of a reference library?"
To be fair, he did only say 99% of posts. That probably accounts for all the FB and Twatter stuff leaving, at best, 1% of posts that might have a longer term use. The signal to noise ratio across the whole of the 'net is pretty poor.