<human>: I'm European and have been living on the East Coast for a few years. I'm having a great time, have met lots of fantastic people, but there is one big thing I keep running into that frustrates me. While I find that people in the US are generally more friendly, courteous and helpful to strangers than Western Europeans are, making close friendships with Americans is more difficult. Where I'm from, if you have a great time with someone, have meaningful conversations, and share very personal experiences/information, and part our ways saying, we should be in touch/call/meet for a drink/dinner etc, you mean it (mostly…). Otherwise you don't say these things, or go out of your way to emphasize them. Here on the other hand, I found out these are mostly empty phrases. I consider myself an extroverted, social person, who can have a conversation with about anyone, but you know it when there is a genuine click and there could be room for friendship. 

Maybe I'm confused by the ease with which Americans share their private lives… because that's something we would be more reserved about sharing? We would consider that as something 'special', while maybe here it's just part of the normal conversation? Maybe it's considered 'rude' not to share? Or 'rude' if you don't part ways sharing all your contact details with remarks to 'call me'/meet up/…? 

As an American, do you run into the same confusion sometimes? Or are there any subtle hints to know if people are serious or not (besides the obvious of never hearing from them again)? When do you know someone is going to be a flake? Any insights are greatly appreciated.

Can you provide a brief overview of the text?
<bot>: If you had a great time hanging out, and part ways saying you'll be in touch/call/have drinks/dinner, how do   you this is serious?