Critics allege that content farms provide relatively low quality content,^[7] and that they maximize profit by producing "just good enough" material rather than high-quality articles.^[8] Articles are usually composed by human writers rather than automated processes, but they may not be written by a specialist in the subjects reported. Some authors working for sites identified as content farms have admitted knowing little about the fields on which they report.^[9] Search engines see content farms as a problem, as they tend to bring the user to less relevant and lower quality results of the search.^[10] The reduced quality and rapid creation of articles on such sites has drawn comparisons to the fast food industry^[11] and to pollution^[2]: