The Liberian Professional Self Image

Question: why is it that over a period of 6 months, one by one, nearly all the Liberian staff at the NGO where I work have printed pictures of themselves working at their desks and taped the pictures to the wall behind their desks? Even the woman who works the security counter sits next to a picture of herself sitting at her workstation. One guy even has a picture of himself working on his laptop set as the wallpaper on that same laptop! I guess this is a cultural difference; if someone did that in the US, I would just assume it was some kind of ironic joke.