"There has to be a very clear and consistent and regular reinforcement of the message that this type of engagement does not mean a tacit endorsement of the SPDC's crimes against humanity or its ongoing violations of human rights."

VOA: standard.2009.09.24

He was forced to remove the image from the spot, a tacit acknowledgement of a misstep.

CNN: Chambliss defeats Cleland in Georgia

In past elections Nigel Farage asked voters to "lend us your vote", a tacit acknowledgement that voting UKIP was a temporary, protest vote.

BBC: An evening with Nigel Farage

But it does provide a tacit sanction of cell phone radiation fears by a recognized authority, an important social signal.

CNN: STORY HIGHLIGHTS