artesea

Allows simple integration between your sidebar widgets and the official twitter widget 
** THIS WIDGET WILL STOP WORKING AFTER MAY 7TH 2013 ** 
This is when Twitter stop unauthenticated calls to their API, and block the old 
widgets. https://dev.twitter.com/blog/api-v1-retirement-final-dates 
This plugin won’t support the new Twitter Widget. 
For more information about them please visit: https://twitter.com/settings/widgets

(Un)offical Twitter Widget

Allows simple integration between your sidebar widgets and the official twitter widget ** THIS WIDGET WILL STOP WORKING AFTER MAY 7TH 2013 **

mclarty

Twitter Hashtag Feed Widget creates a simple, clean Twitter feed of a specified hashtag. This widget is specifically designed to render a lightweight widget that can be completely styled by the user through CSS.
<h3>Custom Theming</h3>
All widgets have the CSS class .widget_twitter_hashtag_feed_widget for uniform styling across all widgets on the site.

Twitter Hashtag Feed Widget

A sidebar widget that creates a simple, clean Twitter feed of a specified hashtag.

(Un)offical Twitter Widget vs Twitter Hashtag Feed Widget