Email of face-to-face?

So, if you want to persuade someone with whom you have a competitive relationship - whatever your and their gender - email might be a better choice. On the other hand, if your persuasion attempt is aimed at someone with whom you have a more cooperative relationship, face-to-face could be a better choice. Unfortunately, it isn't always possible to see someone face-to-face, so it's very useful to be aware of the processes operating in both face-to-face and online interactions.