Twitter
Twitter is a "microblogging" services that allows users subscribe to receive brief updates or "tweets " (a maximum 140 characters) from others whom they choose to "follow." San Diego County's Emergency and Readiness tweets include various announcements and links to its Web site.
Facebook
Facebook fan pages lets users create their own sets of "fans" among whom they share brief updates, photos, links, or other information. San Diego County's Emergency and Readiness Facebook fan pages offer users a place to follow updates and share information.
YouTube
YouTube lets users posts videos to share with others. San Diego County's Emergency and Readiness YouTube Channels offer quick access to many videos and links to more information.
RSS Feeds
Really Simple Syndication (RSS) is a family of web formats used to publish frequently updated digital content. It's a way for users to have news and information delivered to subscribers via "feeds." Users of RSS content use programs called feed 'readers' or 'aggregators' (newer versions of Web browsers offer built in support for RSS feeds).
SMS
Instructions for subscribing to SMS Service
LinkedIn
MySpace