What does "the most gregarious of sharers" mean?

Gregarious means something that is found in a community or a person who likes to be sociable.

Explanation:

The phrase: "the most gregarious of sharers" is a precarious one, in that it is not entirely used in the common literary terms with the use of the word gregarious not clear in the sense it is used.

The word is used for a person who is social or amicable in a society, someone who willingly likes to partake with people.

It can also mean something that is found in a group or a community, usually a plant.

A social or amicable one of a share would mean something along the lines of the plant only.