  In the very large debates on ethics of algorithms, this paper proposes an
analysis on human responsibility. On one hand, algorithms are designed by some
humans, who bear a part of responsibility in the results and unexpected
impacts. Nevertheless, we show how the fact they cannot embrace the full
situations of use and consequences lead to an unreachable limit. On the other
hand, using technology is never free of responsibility, even if there also
exist limits to characterise. Massive uses by unprofessional users introduce
additional questions that modify the possibilities to be ethically responsible.
The article is structured in such a way as to show how the limits have
gradually evolved, leaving unthought of issues and a failure to share
responsibility.
