Rav Nosson Zvi Finkel, The Alter of Slabodka

Whenever R’ Nosson Zvi saw any good deed in a talmid, he would praise and honor him, speak to him for hours, and sometimes even hug and kiss him.  This was especially true when the deed was one of chessed, such as doing someone a favor, caring for the sick, or nice behaviour.

From Sparks of Mussar by R Chaim Ephraim Zaitchik