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Example from instagram that linked seller with many buyers from different places in the world.

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Another example from ebay website.

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An example from souq.com that provide different product in one site which help to link sellers and the possible buyers.

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Mass media is able to join different elements of society that are not directly connected.

Mass advertising tries to link sellers and the possible buyers.

Facebook, eBay online auction site enable people who want to buy or sell items.

Geographically separated groups that share common interest are also linked by the mass media e.g. publicity about people suffering from the same sickness come together and prompt the government to take action.