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Street demonstrations occur across the world. In Rio de Janeiro, June/July2013, they reach beyond one million people. A wrathful reader of \textit{OGlobo}, leading newspaper in the same city, published a letter \cite{OGlobo}where many social questions are stated and answered Yes or No. These millionpeople of street demonstrations share opinion consensus about a similar set ofsocial issues. But they did not reach this consensus within such a hugenumbered meetings. Earlier, they have met in diverse small groups where some ofthem could be convinced to change mind by other few fellows. Suddenly, amacroscopic consensus emerges. Many other big manifestations are widespread allover the world in recent times, and are supposed to remain in the future. Theinteresting questions are: 1) How a binary-option opinion distributed amongsome population evolves in time, through local changes occurred withinsmall-group meetings? and 2) Is there some natural selection rule acting upon?Here, we address these questions through an agent-based model.

The first shall be last: selection-driven minority becomes majority