However, derivative work is much less common with proprietary licensed work and so the viral phenomenon is not as evident.

It could never work as a commercial vehicle; it is more of a viral phenomenon on the Internet.

Examples of viral phenomena in addition to memes are:

In August 2009, the posters became a viral phenomenon online.

It is one of the earliest examples of an online viral phenomenon.

The video has over seven million times on YouTube, becoming a near viral phenomenon.

The images soon became a viral phenomenon, sparking controversy within China and drawing international attention to the issue of forced abortions.

This character was created and spread like a viral phenomenon through text messages in mobile phones.

Can you describe that briefly and talk about the role of "conversation" in viral phenomena?

It later became a viral phenomenon on the Internet and is still used as a training aid.