Oh yes. Women do not touch a lot when it comes to a guy unless they are crushing on him. And if they laugh all the time that is a good sign. If she is single, she is interested. If she is not single, then she wishes she was. Now, where she touches matters too. If it is on the shoulder...not so much. If it is on the arm, more likely!
I do this alot around my guy friends(im a girl) becuase im so happy to see them. they are so funny and bring in new veiws to every thing, they are also less judgemental when talking about important things then the girls i hang out with.;) i would say go 4 it and ask whoever out, i doubt they say no if there genualy happy around you