Social Source Commons

Provides tracking and statistics for each #hashtag appearing in Twitter feeds

Desktop app which sends you alerts from several online social-networking tools—Twitter, FriendFeed, and Flickr

A simple URL shortener. Generates shorter URLs than TinyURL, and has redirection. Useful for Twitter, and supports tracking number of clicks, traffic sources, and time-of-day patterns.

BubbleTweet allows to embed a video directly on your Twitter profile.

Mashup of RSS feeds for popular sites such as YouTube, flickr, twitter, and yelp.

Group message broadcasting for Twitter. Send private messages to specific groups of friends.

A website that helps manage multiple Twitter profiles, pre-schedule tweets, and measure your success.

Integrated social messaging app, enables managing Facebook, Twitter and other feeds from 1 dashboard.

Seesmic Desktop is an Adobe Air application that allows you to easily follow, contact and organize your friends on Twitter and Facebook through a desktop application.

TipJoy allows nonprofits to accept micropayments from individuals on Twitter.

Tool to search recent Twitter messages for specific words or phrases.

TweetBeep emails alerts based on what people are Twittering about a specific organization, product or anything. Similar to Google Alerts but for Twitter.

An application that aims to evolve existing functionality of Twitter by breaking down Twitter feeds into more manageable bite sized pieces. Track Twitter feeds and social media activity.

Shows you your twitter behavior, or the behavior of any twitter user. Nice to see, in your own stats, who you send tweets to the most.

twhirl is a desktop client for twitter, based on the Adobe AIR platform

Twibbon allows your followers to embed ribbons, icons, etc. on their Twitter avatars, and then spread them throughout the Twitterverse. It's an easy and effective first step for launching an awareness campaign on Twitter.

A hosted service that finds other Twitter users that might interest you based on shared Tweet topics.

Type in any Twitter username and this website gives you enhanced statistics about visits, latest tweets, etc.

Twitter Mosaic allows you to generate html code of your Twitter Followers or Friends that you can then embed on a blog or Web site.

This plugin creates an integration between your WordPress blog and your Twitter account. Pull your tweets into your blog and create new tweets on blog posts and from within WordPress.

A hosted service that allows you to add multiple Twitter users to your "Following" list in one simple step. Works well for finding others in similar "TwitterPacks"

TwitterGadget is a clean, robust, web 2.0 style client for Twitter.com, designed to submit status updates to Twitter via your iGoogle homepage or Gmail Account.

Tool for posting to Twitter via email.

Gives people an easy way to post "Tweets" in Twitter about a website by placing a "TwitThis" button onto the website that a user can simply click.

Convert lengthy thoughts into concise statements for use in tweets.

Twuffer allows the Twitter user to compose a list of future tweets, and schedule their release.

A mini-blogging site to have up-to-the-minute updates between co-workers. Similar to Twitter, except with a smaller, institutional focus.