 There are various problems associated with memetic views, most of which focus on limitations of the gene/meme analogy. These worries are sometimes raised by theorists from the social sciences who are hostile to evolutionary theories of culture. But they are also raised quite frequently by cultural evolutionists who argue that the meme concept is not the right way to ground a theory of cultural evolution: it is essential to bear in mind, then, that cultural evolutionary theories in general do not require the meme theory to be true (see Henrich et al. 2008). Here are some of the most frequently encountered arguments against the meme concept (the remainder of this section draws on Lewens, 2007, Ch. 7):