Have you noticed INFPs seem pretty open online compared to INFJs? Like I'm an INFP, and the majority of my friends from MBTI are INFP, and most seem willing to have a convo, and it seems it flows a lot. Whereas I know some INFJs who seem less talkative in text, a bit light-lipped, reserved, guarded. In real life they say INFJ seems more outwardly open because of Fe, but I don't think that's always the case, but it can be. I feel INFPs are more 'verbally' extroverted than their expressions show. Also INFPs have more of an affinity for, and prefer, writing, as a rule.