The number of social bookmarking sites has exploded within three years, leaving someone new the space probably a bit overwhelmed at where to start. If you are new to social networking understand that each social networking site is different, it attracts a different audience with different interests. Thus what interests someone on Reddit might not appeal to anyone on Digg.So who are the main players in the social bookmaking space? And what is the profile of the typical user of these social bookmarking sites? The answers below might surprise you!

Digg.com

Digg is the most popular and notable of the social bookmarking sites. Quantcast estimates that that Digg has about 25 million unique visitors a month. The audience is predominantly male (65%), between 25-34 years of age, with a household income between 30k and 100k. Digg’s demographics have changed as it has become more popular (mainstream). Not to long ago the Digg profile was male, under 25 who made less than 30k a year. Social media topics that do well on Digg include interesting photos, anything anti-Microsoft and lists (top 10, etc).

Propeller.com

Propeller (formely Netscape) is comfortable the second biggest social bookmarking site behind Digg with over 5.8 million monthly uniques, of which 3.6 million (62%) are in the U.S. Netscape also attracts a male biased audience (54) , that is slightly older (45-54 is biggest age group), and 55% of Propeller.com visitors have an household income over $60k.

StumbleUpon

Stumbleupon.com reports over 4.5 million members and Quantcast classifies it as a top 5,000 site that has about 1.5 million unique visitors a month from the U.S. The audience is male biased (56%) and between the ages of 45-54 (22% of visitors). The older demographic also skews the household income with 51% of visitors having a household income of over $60k.

Reddit.com

Reddit is becoming a very popular social bookmarking site with about 1.2 million unique visitors in the U.S., making it slightly larger than Del.icio.us. Reddit attracts a predominantly male (57%) audience that is between the ages of 35-44 (25%). With 65% of the audience having a household income of between $30 and $100k, Reddit is a mainstream social networking site. As a result, political, environmental, business and entertainment news does well with this audience.

Del.icio.us

Del.icio.us is the oldest social bookmarking site and Quantcast classifies it as a top 5,000 site that gets about 1.1 million unique visitors a month from the U.S. The audience is male (53%) and about 47% of them are over 45. Similar to StumbleUpon, 51% of visitors having a household income of over $60k.

Newsvine.com

Newsvine is a top 10,000 site that reaches over 362K U.S. monthly uniques. The site attracts a slightly male slanted audience (54%) and 51% of the users have a household income under $60k.

Fark.com


Fark.com is a much more trafficked site than people expect. With 1,972,698 monthly unique visitors in the U.S., it is bigger than StumbleUpon, Del.icio.us and Reddit. The Fark audience is heavily male (69%), between the ages of 25-34 and a household income under $60k (52%). The Fark audience likes interesting, bizarre and amusing news stories, along with regular photo manipulation contests.

Blinklist.com

Blinklist.com is a top 10,000 site that reaches over 353K U.S. monthly uniques. The site appeals to a more male group (59%) who are between the age of 25 and 54. About 54% of the audience earns over $60k a year.

Clipmarks.com

Clipmarks reaches over 205K U.S. monthly uniques. The site appeals to a male biased audience (58%) with a household income of $30-60k. The site attracts almost equal amounts of people between 25 and 54.

Shoutwire.com

This site reaches approximately 70,742 U.S. monthly uniques. The site appeals to a more male (60%), younger audience (38% are under 24).

So what does the demographic data tells us? One is that the typical social bookmarking site user is male, between the ages of 35-54 with a household income of $60k or more a year. Is this your target audience? If it is not, then these are probable not the main social networking sites that you should be focusing on.

Note that Digg attracts more users than all the other social bookmarking sites combined. Similar to how MySpace dominates the social networking space (and gets the lion share of advertising dollars), Digg is the dominate social bookmarking site. If you are trying to reach this audience, then you have to include Digg in your marketing efforts, simply because the audience is so large, relative to everyone else in this space.