13. The system of claim 12 , wherein said processing unit is further configured to enable sharing of at least one of said clusters with at least one other user or public list.
13. The system of claim 12 , wherein said processing unit is further configured to enable sharing of at least one of said clusters with at least one other user or public list. 14. The system of claim 13 , wherein said processing unit is further configured to receive at least one additional data item relating to at least one of said clusters from said user or said public list.