9. The non-transitory machine-readable medium of claim 7 , wherein the operations further comprise: responsive to receiving the endorsement of the particular skill from the first member, increasing a calculated skill rank for the second member for the particular skill.
9. The non-transitory machine-readable medium of claim 7 , wherein the operations further comprise: responsive to receiving the endorsement of the particular skill from the first member, increasing a calculated skill rank for the second member for the particular skill. 10. The non-transitory machine-readable medium of claim 9 , wherein an amount with which the calculated skill rank for the second member is increased for the particular skill depends on a skill rank of the first member for the particular skill.