(an idea) spreads through (something)

Use the verb "spread" to describe the way that an idea becomes more and more well-known.

This is an idea that's worth spreading.

The way that it spreads can be described with "through":

It originally spread through Twitter. Now it's starting to get some attention from major TV talk shows.

By the way, diseases also spread as well as ideas:

It spreads through sexual contact.

This phrase appears in these lessons: