do not worry, there are always some people who will share your content if you allow it. I am not sure about the social bookmarking sites but these 3 is a must have - Facebook, G+ and Twitter.
The good thing is that these 3 show how many people has already did that, so others may be more willing to share. Of course you may need to ask your employees and friends to click and share in order to show decent numbers.
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