Rating system in app

How can I add something like a pop up when my app is used several time, a pop up opens asking for the user to review my app?
Also how can I add buttons that upon click open Facebook Page/Youtube Page etc from within the mobile game app

I would create an attribute, add 1 to it every time the player wins.
After how many times you want, make an actor popup if the attribute is equal to the number of times.

I don't think you can open webpage within the game, you need to link the buttons to the address and they will go to the link when clicked.

Like those apps that have a share on Facebook button,how can I make that in my mobile game?

If you want to share a score on Facebook or twitter there is an extension called the Share Extension.

My game is a level based game but I want that on the menu there are buttons that can share the game on twitter,google plus and Facebook
Is that somehow possible?