Here's the list of top popular social websites
you can use to increase your online business with:
Facebook – the world’s biggest social networking site. Set up your online business profile and create a fan page for your business. Invite your customers and subscribers to join so you can easily alert them whenever you have any new updates to share.
Twitter – Micro-blogging social networking site that allows its members to send out short posts to people who are following you. You can even have your video embedded with your links to get maximum leverage from your marketing.
YouTube – Top video-sharing site on the internet and provides some unique ways for you to establish yourself online.
Digg – News-sharing site where members can post links to their favorite news articles. It also allows them to make comments or to vote for the ones they like best.
Stumbleupon – On this site you can check out and rate web pages, videos and photos. When you “stumble,” the results that shows up are ranked based on your previous ratings and the ratings from other members. When other members give your site a good rating, your site could show up more often in their results which could bring more traffic.
FriendFeed – Is a real-time feed aggregator that consolidates the updates from social media and social networking websites, social bookmarking websites, blogs and micro-blogging updates, as well as any other type of RSS/ Atom feed
Delicious – Delicious is a very popular bookmarking site where you can save links of your favorite websites, blogs, articles, or other resources, and share with other people. The power of this is that you can comment on each other’s links, and these in turn link to your personal profile which should have your website link.
Diigo – An abbreviation for the “Digest of Internet Information, Groups and Other stuff,” Diigo is a social annotation service that lets users add highlights and notes in situ to any web page. These overlayed comments made through Diigo can be made either public or private; other Diigo users can then read public comments and reply/interact to comments. Diigo combines aspects of social bookmarking, full-text search, annotations, tagging, and sharing. A browser plugin allows you to share your annotations directly with others, and you can save annotated pages to numerous other bookmarking services as well.
Plurk – Plurk is a free social networking and micro-blogging service that allows users to send updates (otherwise known as plurks) through short messages or links, which can be up to 210 text characters in length (previously 140).
Scoop.it – Want to get heard in the social web noise? Scoop.it helps you reach an audience that shares your interests by.
Linkedin – Manage your professional identity. Build and engage with your professional network. Access knowledge, insights and opportunities.
Pinterest – A content sharing service that allows members to "pin" images, videos and other objects to their pinboard. Also includes standard social networking features.
MySpace – Discover, share and connect with culture, creativity, sound, images and people.
Google+ – Aims to make sharing on the web more like sharing in real life. Check out Circles, Events and Hangouts.
Tagged – Tagged makes it easy to meet and socialize with new people through games, shared interests, friend suggestions, browsing profiles, and much more.
Orkut – Social networking and discussion site operated by Google.
Ning – Built from the ground up for social, Ning’s scalable hosted platform gives you the tools and expertise you need to publish and connect with your community – all in one place. Easy. Powerful. Affordable.
Meetup – Helps groups of people with shared interests plan meetings and form offline clubs in local communities around the world.
Reddit – Reddit is a social news website where users can post links to content on the web. Other users may then vote the posted links up or down, causing them to appear more or less prominently on the reddit home page.