Re: Can I just have them all?!
There's nothing wrong with flirting with all of them without doing anything.
I recommend making them genuine friends. Like you said, social proof. They will help you get other women.
If you decide to mess with all of them then you have to come across that you're in search for that one special girl, so you don't have to apologize for talking to all of them.
"All things are subject to interpretation. Whichever interpretation prevails at a given time is a function of power and not truth."