Here you go....
1. Avatar – An avatar is graphical image that represents a person online.
2. Bit.ly – Bit.ly is a free URL shortening services that allows user to shorten URLs to make them much easier to share on social sites such as Twitter.
3. Backtype – BackType is a social media intelligence company that helps companies measure their social engagement and impact.
4. Blogroll – A blogroll is a collection of links to other blogs, normally found on a blog’s homepage.
5. Compete – Compete is a web-based application that allows people to monitor and compare the online performance for different websites.
6. Delicious – Delicious is a free social bookmarking web service that lets users tag, save, manage, and share web pages from a centralized source.
7. Digg – Digg is a social news website that allows people to discover, share, and vote on content. Articles garnering the most votes appear on the homepage of the Digg site and are seen by the largest portion of vistiors.
8. Disqus – Disqus is a comment system and moderation tool that plugs your website into a community network-connecting your blog to a global audience. Easy to install. Powerful features.
9. Flash Mob – A flash mob is a large group of people who assemble suddenly in a public place, perform a pre-defined action, often a brief dance or pointless act, and then quickly disperse
10. Foursquare – Foursquare is a location-based mobile platform that allows you to share your location and connect with others by “checking in” via your smartphone or SMS.
11. Hashtag – A hashtag is a word or phrase preceded by a “#,” to collate tweets. A hash tag is used in Twitter as a way for people to search for tweets that have a similar topic.
12. Hootsuite – Hootsuite is the ultimate Twitter toolbox. With Hootsuite, you can manage your entire Twitter and social media profiles, pre-schedule tweets, and view web metrics from one easy-to-use dashboard.
13. Mashup – A mashup is any type of media — such as a song, content, or video — that combines material from multiple sources to create a new work.
14. News Reader – A news reader allows users to aggregate content – blogs, articles, etc. — from multiple websites into one place using RSS feeds. This allows you to more easily scan through and consume content. An example: Google Reader.
15. Postrank – PostRank is the largest aggregator of social engagement data in the industry. The platform tracks where and how users engage – in real-time, helping publishers understand which type of content promotes sharing on the social web.
16. Posterous – Posterous is a simple blogging and content syndication platform that supports integrated and automatic posting to other social media tools such as Flickr, Facebook, Twitter, etc.
17. Prezi – Take the tour below to learn about this web-based presentation tool
18. Sentiment – Sentiment refers to the to the attitude of user comments related to a brand online. There are social media monitoring tools, such as Radian6, that allow you to track and measure sentiment based on keywords.
19. Tag Cloud – A tag cloud is a visual depiction of user-generated tags, typically used to describe the content of web sites and blogs.
20. Tweetup – A Tweetup is an organized or impromptu gathering of people that use Twitter.
21. Yelp – Yelp is a social network and local search website that provides users with a platform to review, rate, recommend, and discuss local businesses. Yelp has more than 39 million unique visitors per month.