WP Tweet Button

It can be added on posts, with configuration settings for the title of an entry or a default message for tweets.

The tweet button can be positioned and styled in any way possible in the backend settings page.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Features:

• General and post specific settings for recommendations and Tweets text.
• Vast array of Tweet Button placement and alignment options.
• WPTouch Support.
• Can be set to vertical, horizontal or no counter.
• Authors can configure their own Twitter accounts on their profile pages. (WP3.x only)
• Supports Auto-Tweeting posts.
• Supports all Tweet Button languages.
• Supports exclusion by custom post type
• Possible to add rel="me", rel="shortlink" to header and rel attribute to the tweet link for SEO.
• Google Analytics support for campaign tracking.
• Option to switch between '{text} {link} via {@user}' and 'RT {@user} {text} {link}' formats.
• Templatable Tweet texts using tags (%POSTTITLE%, %BLOGTITLE%, %BLOGHASHTAGS%, %BLOGHASHCATS%).
• Supports data tag output.
• Includes hooks for 3rd party developers.
• Supports WordPress 3 shortener functions.
• Initial URL shrinking with the Twitter Friendly Links Plugin and YOURLS: WordPress to Twitter Plugin.
• Initial URL shrinking with 3rd party shortening services: awe.sm, b2l.me, bit.ly, j.mp, cli.gs, sl.ly, snipr, su.pr, tinyurl
• counturl support for consistent url counts across URL shorteners.
• Supports option to load the script in the footer.
• Referral can be turned off by removing the username.
• Additional styling options.
• Supports automatic placement and manual using tweetbutton(); function or [tweetbutton] shortcode.
• Supports forced manual placement for a combination of placements.
• Includes caching controls for WP Super Cache and W3 Total Cache.
• Tweet Button can be excluded from bottom of posts on front page.
• Optional no-javascript support.

What is new in this release:

• Fixed Google Tracking link.
• Updated preview images.

What is new in version 2.1.0:

• Added option to exclude button blow posts in the archives (No After in Archives)
• Optimized code resulting in cleaner text cuts
• Added support for %POSTCONTENT% variable in tweet customizations
• Added "Long Tweet Mode" (In case you don't want to use %POSTCONTENT% as your "Custom text"). This allows you to auto-tweet the first part of your content followed by a link that takes the reader to the entry on your site.
• Links are included in all Autotweets by default. Options to decide action has been removed.

What is new in version 2.0.9:

• Added support for # Analytics query delimiter (for people that use setAllowAnchor). Enabling this option may require clearing your shortlink cache by using the "Delete all previously saved shortlinks when I save." option.
• Prevents id duplication when forcing manual placement.

What is new in version 2.0.7:

• Added option to use author configured twitter account as recommended user.
• Added RPC publishing auto-tweet support.
• Added oAuth enabled Goo.gl tracking under Advanced Settings.

What is new in version 2.0.6.1:

• Added Goog.le support (requires PHP JSON)
• Cleaned up some code.
• Added validation tests.
• Resolves issue where superfluous requests to shorteners are sent.
• Additional settings for auto-tweeting.

What is new in version 2.0.6:

• New feature allows admins to set default twitter account, ignoring author settings.

What is new in version 2.0.4:

• Addresses issue related to related users.
• Addresses issue related to Transposh Translation and short URLs.
• Addresses issue related to links on main blog page.

What is new in version 2.0.3.3:

• Addresses issue where a single shortlinks is generated and saved for all posts on the main page.
• Added option to clear shortlink cache per post/page.

Requirements:

• WordPress 2.7.2 or higher