At one time, these memes crossed the line from obscurity to mainstream. Even though Facebook and Twitter play a huge role in amplifying a challenge or helping memes go viral, the origins of that meme can usually be traced to anonymous social networks, like Reddit and 4chan.
Viral content tends to start in smaller, closed networks (that often don’t use real names or identities). Vine and Snapchat – even Facebook Groups – are other places that bring together smaller, more tightly-knit communities with shared and interests and identity that tends to help incite participation.
Source: searchenginewatch.com
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