Smart phones help, but it is very regular for people to argue a point without having any citations to back themselves up.  I'm guilty of this too.<p>What it has lead to is that I will often cede the point for the time being, I will then look up the relevant literature and either bring it up the next time I'm with the person or send them the link.  I try to do this even if I'm wrong.<p>I'm sure it doesn't help me come off as sociable, but I like to contribute to the spread of fact-based discussion which we have so little of these days.