Avatar – Graphical images like logo, image or a photo that represent people.
Crowdsourcing – Harnessing knowledge and expertise of a group of people to solve a problem or contribute content.
Freemium – A form of business model that offers a part of the product for free and then enables you to advance and add additional options at a premium price.
Microblogging – The act of posting short messages to a website, for e.g. Twitter is one of the best examples of the same.
Hashtag – The pound sign (#) placed in front of keywords or phrases and used on Twitter for people to follow and trace those specific conversations well.
Social Bookmarking – To add a link to a website that can be tagged and organized by the user. Pinterest, StumbleUpon, Digg and Delicious are some of the social bookmarking sites.
RSS – Really simple syndication that allows subscribing to blogs or some other media that is delivered to you through a feed.
Widget – It is a chunk of code that adds functionality to your website without you having to write it yourself. It mostly displays static content.
Blogroll – List of blogs displayed on sidebar of another blog mentioning what that specific blogger reads regularly.
Permalink – A web address of a specific post within a blog or website.
Plugin – is a software component that adds functionality to a website or blog. For example, social sharing buttons are usually packaged as a plugin so that it allows people to share from your website or blog.
Aggregator – A software application or a website that assembles information from various sources.
Embedding – It is the act of coding a website so that the videos and photos could be hosted on one website yet viewed from another.
FeedReader – An Application used to amass RSS feeds and display them as well. Google Reader, NewzCrawler and FeedDemon are some of the examples.