Bookmark are a very common strategy of link building, one of the most easy to implement: while many SEO blogger and expert discuss about their effectiveness, we should admit that are the fastest way for spread knowledge about our fresh content to users, i.e while we are doing an interest-targeted strategy.
For example, we should need to spread the work about this blog article, and post it into SEO directory by Reddit: here we will find just SEO and persons strictly interested to this matter, and this will be anyway great for our content marketing. Bookmarks are very important for this reason, and they shoudl help into ranking expecially because, into the Google official documentation, there is more than a refer about "bookmarked" webpages as also "best ranked". While "low-quality directory or bookmark site links" are bad for our site, it is important to NOT confuse between social signals and ranking signals: the first are very easy to obtain (i.e just look and/or parse into the page), while the latter seems very complicated to analyze and could take you in fall. You are out of way if you are thinking: "ok, social bookmarks will be my only and favourite link building tool".
So social bookmark should serve as "targeted traffic" vehicle for your single website and/or pages (i.e post SEO article into SEO community, and so on), while you DON'T think about ranking at all: as a matter of fact, varying each title and description though time should help visitors to find the way to you site, and this should be enough for using them while doing SEO.
Help visitors and potential customers to find the way to you site: this is not SPAM at all, if you are doing this with common sense and, perhaps, if your website is high-quality with useful content at all.
Let's see the list of the most common social bookmark for your website!
- Del.icio.us - very useful and fast to note favourite webpages and sharing it with other users. One of the most famous bookmark in the world!
- Diigo - Very interesting bookmark, you should need it for categorizing your links and much more.
- Digg - One of the most famous and important, it is not so easy to appear in first page but, when it happens, you should be proud.
- StumbleUpon - Post your website around here and get visited by other, interested to your categorization, users.
Other minor bookmarks social sites are: