It was not until later that they learnt from television that they had joined in an "outburst of patriotic feeling .Tver was chosen because it is the land of Mr Putin's forebears, but similar "voluntary" demonstrations have been staged all over Russia.
It's voluntary alienation.
"This is another demonstration of why voluntary steps aren't on their own going to address the lack of transparency in the digital ad space".
In one state, Minnesota, the demonstration program will be strictly voluntary.
"I'm nervous," says Gina Walsh who is part of "I Love Ferguson", a voluntary organisation set up after the August demonstrations to help residents and businesses who were affected.
Demonstrations, blockades, threats and meetings eventually led to a voluntary code of agreeing a fairer price between farmers, processors and supermarkets.
A striking demonstration of between-task competition affecting task choice comes from studies of voluntary switching between tasks differing in their relative strength (Liefooghe et al. 2009; Yeung 2010).
