https://www.washingtonpost.com/graphics/business/wonkblog/majority-illusion/
The majority illusion is interesting, we don't all have the same number of friends, and popular people with a lot of friends have a disproprtional impact on apparent opinion.
Contrary to the article, I'd suggest this effect tells us why we need voting, rather than polling, since, as with the Scottish referendum, a lot of people thought it wiould pass, or be close, but the real result and will of the people was quite firmly against.
It also has implications for our model of revolution, we can show that once a considerable number begin to agree with us, it is more likely that people will come to accept and discuss socialism in our terms.