Aelora

rTwit adds a short code that allows you to embed any Twitter feed into posts and pages on your WordPress site.
This plugin came about from my need to embed tweet from software authors on a page describing the software.
Requests are cached for 30 minutes, by default, so that subsequent page views can load from cache rather than having to reload and reparse the Twitter feed. Links are set to open in a new window, although that is optional.

rTwit

Quickly embed any twitter feed into a post or page.

marksabbath

Nathan Rice

StudioPress

By simply dragging this widget into your sidebar or any widgetized area, you can easily place icon links to your various social profiles like twitter, facebook, flickr, etc.

Social Profiles Widget

This plugin/widget allows you to insert icon links to your social profiles in any widgetized area.

rTwit vs Social Profiles Widget