Who is a desplazado?

I get in a cab in the other night and the driver asks if I know where I'm going. "I just started this job a couple of weeks ago," he says. He looks young, probably my age or even a little younger.

So I ask where he was from and why he moved to Bogotá. He had lived his whole life on a farm with his family in Tolima, the departamento (equivalent of a state) next to Cundinamarca (where Bogotá is). He says that the guerrilla has been there for a while and that there aren't many job opportunities there. Part of his family has already moved to Bogotá, and the other part is still on the farm. He doesn't seem to want to talk much about it, but it gets me thinking.

What does it mean to be displaced in this country, which has the highest number of internally displaced persons in the world? Is this man, or someone like him, counted among the 3.67 or 5.2 million desplazados (depending on who you ask) in Colombia? He was not forced off of his land, some of his family members still live there, but he chose to leave because of the dire economic and social situation. If you choose to leave under these circumstances, how much of a choice do you have?