Its very simple,
We've noticed out and about on our travels that there is a noticeable level of improvement with bookmarked links when they appear from more than one user account. we have been soft testing this on client work now for quite some time and found a very "unscientific" piece of information that effectively means that if you bookmark a link with more than about 5-6 different accounts it confers an additional level of importance in the eyes of the Search Engines.
Now as to the exact amount of this so called importance, nobody is too sure but we do know that it has made a difference in our experience with client submissions (yes contrary to public perception we do use this Network for our own Client submissions too

So to remedy this we have introduced the Members only Bookmarking Exchange - SLS Bookmarking Exchange whereby members can enter in the details of urls / links they could do with extra bookmarking support with and then other members can then offer to help out. Now this is done very much on an unofficial basis and it is not manadatory that you take part but......it kind of makes sense for all of us to help each other out as and when the sitation arises.
We all pull together and then we'll all succeed - a more modern day equivalent of the old college T Shirts of the Seventies that always proclaimed "United we stand, divided we fall".
For further instructions as to exactly how this system will work then log into your members area if you have not done so already and then in this area you will be given exact instructions as to how this system will work.