What is it?
Digg is the grandpappy of the social bookmarking sites. Started by Kevin Rose, it allows people to submit stories from pages on the internet. These submissions are placed in a constantly updated pool of stories for others to "Digg" (vote up) or "Sink" (vote down).
An algorithm looks at the Diggs and decides which ones are to go "Popular", or be placed on the coveted 1st page. Many servers have crashed by the exponential increase in traffic from making it to the front page of Digg.
Strengths
No other site has the instantaneous effect that Digg can have on a popular story. From a SMO point of view, it is the light at the end of the tunnel, as traffic is guaranteed. From an SEO point of view, the links can be strong when a Digg from a high PR/TR user is indexed at the right moment.
Getting Dugg well is a guarantee for indexing.
Weaknesses
It takes a lot of effort, Digging other people's stories, making friends, and luck to go popular. Above all else, it takes interesting stories, videos, or articles. Still, having the best written piece ever is no guarantee without some help from friends. If a story doesn't get Dugg quickly by a few people, within the first hour or so, it is doomed to sink to obscurity.
Some Diggers have a strong enough base of friends and reputation to post articles on about C-Span and go popular. This is a flaw in the system, but it also helps. It is possible for someone to go on, post a single story, and have it go popular. I've seen it happen. I've also heard about people winning the lottery, though I never seem to get close.
Nofollow
Digg has held strong and not adopted the dreaded nofollow attribute.
Conclusions
Anyone who wants to get into SMO must get into Digg. It's the Google of social bookmarking.
More about SEO can be found on Automotive SEO, a specialized blog about search engine optimization for car dealers.
Social Bookmarking
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