It's a good article for newbies,
But readers should know (IMO) that social networking and bookmarking services are only useful for networking, and finding those with similar interests, not for the actual "link" you receive from it (in an SEO sense). And those ways also aren't likely to convert into clicks, sales, conversions, etc.
One other distinction I think you should make in the article is that these are FREE ways to advertise, because there are always services such as Adwords for those who can afford it.
(Also, I don't know about your "asking for diggs / stumbles" in this thread though, as great content doesn't need to be asked for, people are smart enough to choose what they feel is "digg or stumble worthy")
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