Feat for "smooth operators"

[Nikosandros]

I would like to create a feat for the prototypical "smooth operator" or the "face" of the party, if you wish. This is a character that excels in social interactions. The concept sounds intriguing (at least to me), but I'm rather stumped for ideas. I would probably start with a +1 to charisma, but I would like to get some suggestions for other benefits.

 

[peterka99]

Advantage on rolls to change attitudes- conversation reaction (DMG p245)
Double proficiency
Double ability modifier...

Modifiers: renown, appearence, spell-aid (ex: enthralling voice)...