Eliezer, in No Logical Positivist I, condemns the positivist notion of verifiability for excluding some perfectly meaningful propositions. For example, he says, it may be that a chocolate cake formed in the center of the sun on 8/1/2008, then disappeared after one second. ... But there's no way to test it ... so the logical positivists would dismiss it as nonsense.

As I recall, this interpretation was disputed in the comments on that post. In addition to referring readers there, let me also direct those interested in learning more about logical positivism to this interview with A.J. Ayer. If memory serves, he mentions espousing a view of ethical and aesthetic statements similar to Yvain's interpretation of statements like "Islam is a religion of peace" (often called emotivism, or the "boo-hurray theory").