What Do Netflix, Technorati, Craigslist, Typepad, Vox and LiveJournal all have in common? They’re offline today, that’s what. A power outage in San Francisco has left at least 20,000 customers without electricity and might be partially to blame. These datacenters are supposed to have redundant power sources, so it may not be the entire story. If you have more info, please comment and we’ll update the post.