Do you mean something more specific here? In general if you have a problem along the lines of "I've a large volume of data and I want to extract statistics and run some deep analysis against it" then in my experience Hadoop is almost always worth considering.
Joined: Dec 08, 2009
Well, in situations such as millions of users in pilgrimage in Mekka or millions of tweets as the case in uprising in Tahreerdrhadeel square in Egypt ... These situations are what I meant by crowd sourcing