Top Joomla Twitter Extension : Joomla no doubt is the best CMS and twitter is best micro-blogging service ,There are dozens of twitter extensions available but some of them are really awesome as listed below

Latestweets: This Awesome module display your(s) latest tweets on Joomla .You can display any twitter-user tweets on your Joomla site by simple adding the twitter user-name.

1 - It supports - Single + Multiuser tweets display,

2 - Compatible with all the latest web browser's Firefox, Chrome and Internet Explorer-7,8 .

3 - Its very easy to configure and handy to use .

4 - Mouse Driven Scroller.

Tweetboard:Tweetboard is a fun and engaging micro-forum type application for your website. It pulls your Twitter stream in near real-time (max 1 min delay), reformatting tweets into threaded conversations with unlimited nesting. Conversations that spun off the original conversation are also threaded in-line, giving your site visitors full perspective of what's being discussed.

Twitter Fan Page :This Awesome modules display(s) you twitter fan's on the your site.This module also display fan list on your twitter Page

1 - Awesome look.No page refresh for adding the fans

2 - Support all the modern web browsers(firefox,chrome,IE7+)

3 - Display fanlist on your twitter page.

5 - This extension cache for 5 minutes .

WhoTweet: This Awesome module display your site track record in twitter . This modules also fetches user images from twitter.

1 - Display Twitter pictures of people who tweet your link.

2 - Many transition options like opacity, height and width.

3 - The button is not Iframe-Based. Which means you can easily customize its style to blend into your theme

4 - The button makes use of jQuery DOM-Manipulation (No document.write) for better and optimal integration with your code.

5 - Working fine with all the browser