How do politicians, businessmen and celebrities build their own networks and think tanks?

Politicians use meetings, inspections, studies, speeches, inspections, further studies, sports and other methods.

Businessmen use transactions, parties, shopping, traveling, treating guests, giving gifts, promoting sales, recruiting, raising funds and so on.

The above celebrities are all included in social celebrities, and some are military, educational, artistic and entertainment circles, all of which have their own activity circles, and it is easy to penetrate each other.