What is wrong about being nostalgic?

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During a full week in Myspace, I changed my mood from mischievous to nostalgic. Once done that, I started to receive messages from readers asking me what was wrong – given that some considered that being nostalgic was a bad thing in itself.
But I don’t think that being nostalgic for a week is such a problem.
So, here is the question of the week: how do see nostalgia?

P.S : For the next weeks, I shall be posting here the questions of the week under written form given that I will be travelling.