Using video on your magazine website.  It's very easy to share viral videos that are hosted on open social media sites like YouTube.  In addition to public channels, there are also services like Brightcove that enable you to control a custom player.

Magazine RSS Feeds are a great way to get content publicity. RSS Feeds for magazine publishers can be more effective than email newsletters since they instantly deliver article content feeds to people that has added your magazine feed to their rss feed reader.