Why so many SEO posts all of a sudden?
jacquesm: It's not just SEO, it is practically any subject on HN that gets a periodic wave of interest.I think it is simply tied in to the nature of the web. If you 'inject' a bunch of users via a link on HN in to a spot on the web then from there they will spread like sinking a mineshaft will exhaust the resources in the neighbourhood of the shaft.Then, when that particular mine is exhausted (no more interesting content to be found around that locus in the web) the subject dies down until someone finds a new and untapped reservoir.I've seen this happen around all kinds of subjects, from programming languages to hardware hacks and political stuff.