1. Introduction
The notion of microtasking as one of the crowdsourcing model that is widely adopted in developed digital economies for tapping into human intelligence or micro-workers in solving specific digital tasks (e.g. ad-hoc information gathering, tagging, and classification) that cannot be easily completed by computers [1] [2]. A few micro-work platforms are also emerging in developing countries [3], particularly for minimizing rising unemployment in disadvantaged communities [4].