I just think of an opener,haven't field-test it yet.I don't know whether there is this type of opener yet.so here how it goes

PUA: Hey,i need a female opinion on something,it will just take a few minutes and i hope u dont't mind.
HB:Yeah sure
PUA:If i were to add u on facebook,would u approve me?

If NO
PUA:I guess so.That's why i like to use the classic way.Do u know what it is?
HB:No
PUA:I'm a stranger and now we are talking. I guess being direct is the best way.U look so amazing and i drop by just to know u.Hi, I'm...........
HB: (Laughing).I'm.........

If YES
PUA: (neg) oh i never thought u were this easy.Do u always approve stranger and never talk to them?
HB: Erm......
PUA: I never like technology and i am classic guy.I just thought u look so amazing and drop by just to know u.Hi,I'm......

Any comments??

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I am new in this field

dont see why not! I use these kinds of openers regularly, not with complete strangers but with girls I've seen around or in a pub or something. I'll usually make up a cheesy line and say 'sorry about earlier btw' and when she replies 'what?...' because clearly we havent spoken before and ill say 'was it you walking past the bus stop and my mate was shouting out the window of the car?' then when she says no and probably laughs just change the subject and start chaffing away!

Cant say im a fan of just adding random girls though and just saying i added you because you were hot, give it a go though just dont use it on too many as girls do talk and you may get caught out!