Laconica (pronounced "luh-KAWN-ih-kuh") is a Free and Open Source microblogging platform. It helps people in a community, company or group to exchange short (140 character) messages over the Web. Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to sites like Twitter, Jaiku, and Plurk.
TwitterGadget is a clean, robust, web 2.0 style client for Twitter.com, designed to submit status updates to Twitter via your iGoogle homepage or Gmail Account.
Hey there! Owing to current issues affecting Twitter, only direct messages are currently being read. We'll let you know when you can use @replies again, but for the moment, stick to DMs. Sorry about that.
Social Mention is a social media search engine that searches user-generated content such as blogs, comments, bookmarks, events, news, videos, and microblogging services.