Any SMM manager worth her salt knows it, as it is one of the principles of the profession.

Rule number 2: persuading major influencers is hard. You should target their connections instead who are not that popular (close friends, family members etc.) Once you persuade them, they can influence your primary targets, who will spread the message to their numerous following.

Rule #3 (advanced): always draw a map of key connections (as counted in the number of interactions) in the network you are working in. This will help immensely in designing your influence strategy.

Here. With some practice, you can now beat the SMM game.