socializer

noun

1. One who socializes.

   “In public he put on a performance that was at once outraged and outrageous, but usually he did not carry grudges into his private life. Exuding the backslapping air of a socializer who loved to gamble and drink, he could not understand why people whose careers he had ruined and publicly ridiculed would be hostile to his friendly advances.”

   “I remember reading an article that described three personality types – socializers, loners, and aloners.”