ENTP friend: Ne dominant. Extremely sociable, albeit zany
ENFP mom: Ne dominant. Extremely sociable, albeit zany
INTP me: Ne auxiliary. Only sociable in specific situations, however have been told I appear sociable/talkative etc
Ne manifestations:
Curiosity: Great when first meeting someone, but wears out quick
Zaniness (funny ideas): good for fun but a lot of S types won't be able to meet you on this level
Deep & Meaningfuls (non-funny ideas): good to pass the time but again, a lot of people won't be able to meet you one this level
Fe manifestations (all to be used sparingly):
Smiling: people love this but if you revert to Ti deadpan too quickly people won't know what to make of it
Breadth of interactions: "talk to everyone at the party, go home with no-one". Eg, noticing someone isn't in the group so "merging" them into it
Being "nice": treating the person as an individual, being respectful and trying not to offend them, laughing when they laugh or smiling when they smile.
Self-Disclosure: useful to establish trust
I would wager that if honest, most INTPs wouldn't place a great emphasis internally on the Fe things above, but to be healthy would do just enough not to be disliked, while still maintaining their Ti/Ne core.
Also, using too much Fe can result in bullies (xSTJ types mostly) taking advantage of your desire to be in the group. This person with power in the social group can choose to ignore or ostracise you, so you need a strong ally in the group. My ESFJ friend struggles with this a bit as he is "too nice".