Haris Zulfiqar

Twounter simply returns the number of followers for a twitter username.
You have two options to fetch the number of followers for a username.
You can use the function <code><?php echo twounter('username') ?></code> in your template files or you can use the twounter 
shortcode <code>[twounter]username[/twounter]</code>in post/page editor to return the numbers of followers for the 
username.

Twounter

Twounter returns the number of followers of a twitter user in simple text format.

Efren Labrador

This plugin lets you put your tweets in your wordpress site. You can add it as a widget in your sidebar, you can customize the way it looks and what twitter account you want to show on your feeds. You can also show as many twitter accounts as you like.
You can read the full explaination on <a href="http://webgeeksolution.com/156/wgs-twitter-feeds/" rel="nofollow ugc">wgs twitter feeds</a>

WGS Twitter Feeds

This plugin lets you put your tweets in your wordpress site.

Twounter vs WGS Twitter Feeds