Follow Underscore for updates on Twitter or for Notify specific stuff you can also check out its Facebook page.
During the next couple of days there will be easily accessed links placed on the appropriate places on the site.
Very good list and I certainly use most of these, although there are a couple that are new to me. Just to ass to this (and I oculdn;t see it on a quick skim through), you can use onlyWire to automate your submissions. It definitely saves time but the only downside is all of your submisisons will have the same description.social media craze Hope this helps