Coffee Shop Dating 2.0

At the coffee shop today, I witnessed Coffee Shop Dating 2.0.  There was both a PDA date and Lap Top date, simultaneously taking place. 

 

Is a PDA date synomous with the old "first base", with a lap top date being "Second Base, on the same network" and so on?

I could not tell what was going on, since there was no communication between the two people on each date.