Jaiku is described as 'Create your own microblog and connect with your friends. Post from the Web, by SMS, or from desktop clients. Add comments, use icons, link Webfeeds. Take it with you on your phone' and is an website in the Social & Communications category. There are four alternatives to Jaiku, not only websites but also apps for a variety of platforms, including PHP, Self-Hosted solutions, Windows and Windows S. The best alternative is Twitter, which is free. Other great sites and apps similar to Jaiku are Friendica (Free, Open Source), Rememble (Free) and Plerb (Free).
Friendica is a distributed social network application. Which allow users to connect with others via their own Friendica server, but may also fully integrate contacts from other platforms including Twitter, diaspora*, Pump.io and StatusNet into their 'newsfeed'.