How is this newsworthy and why are people up-voting it?
You can claim that the release of standard CMS features by one company or another is not newsworthy (which is why we have the little arrow over there by the link) but I'd then submit that most developments by technology companies (large and small) are less then entirely novel. If those developments are deemed not-news-worthy, HN will have even less to do with the activities of entrepreneurial operations.
I might be interested in hearing about major or innovative new features at posterous but these seem to me to be fairly standard features for a blogging platform and thus not very newsworthy. We don't get front-page stories every time wordpress or tumblr add a new minor feature.
So why are people upvoting this? Is it people who are posterous users and who are upvoting it as a sign of approval? Or people who want to show their support for posterous because they're a YC company. Or are there people who genuinely think that the fact that a blogging app now lets you create a page is really interesting tech news.
So no juice needed. Just regular voting.
I'm not complaining coz I'd do the same if I was in YC. HN is just like TechCrunch in that YC startups 'unfairly' get more exposure than non-YC ones. Building unfair advantages is essential to startup success.
It's not YC doing anything, just us the audience clicking on the arrows.