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15% of viral campaigns in the past year achieved the goal of prompting consumers to promote the marketer's message. - JupiterResearch, Viral Marketing: Bringing the Message to the Masses (2007)

"Relatively older" online users are more likely than "relatively younger" users to forward advertising messages to friends or tell friends about ads. - JupiterResearch, Viral Marketing: Bringing the Message to the Masses (2007)

51% of respondents report having clicked "forward to a friend" links in marketing email, but 38% have never seen these links. - Epsilon (2007)

44% of the largest retailers offer send-to-a-friend functionality in their emails on a regular basis. - Email Experience Council/RetailEmail.Blogspot (Nov 2006)

Of the largest line retailers offering send-to-a-friend functionality, 92% allow the sender to include a message. - Email Experience Council/RetailEmail.Blogspot (Nov 2006)

Of the largest line retailers offering send-to-a-friend functionality, 18% allow the sender to change the subject line. - Email Experience Council/RetailEmail.Blogspot (Nov 2006)

Of the largest line retailers offering send-to-a-friend functionality, 15% list themselves in the from line, while the remaining 85% list the sender in the from line. - Email Experience Council/RetailEmail.Blogspot (Nov 2006)

Of the largest line retailers offering send-to-a-friend functionality, 10% include a link to the forwarded email's content rather than including the actual content in the body of the email as the other 90% do. - Email Experience Council/RetailEmail.Blogspot (Nov 2006)

Of the largest line retailers offering send-to-a-friend functionality, 44% include a subscribe link at the top of the forwarded message. - Email Experience Council/RetailEmail.Blogspot (Nov 2006)

44% of retailers including a newsletter subscribe link at the top of the forwarded email. - RetailEmailReports

Fifty-six percent reported being less likely to forward marketing-related messages online. - Sharpe Partners (Jan 2006)

43 percent said they were more likely to send such messages. - Sharpe Partners (Jan 2006)

5 percent of respondents said they would refuse to share content with a clear brand message. - Sharpe Partners (Jan 2006)

75 percent said that brand sponsorship had no impact on whether or not they choose to forward a message. - Sharpe Partners (Jan 2006)

19 percent said branding actually encouraged them to forward a particular piece of content. - Sharpe Partners (Jan 2006)

7 percent cited branding as a negative in forwarding an email message. - Sharpe Partners (Jan 2006)

Comedy is the most effective tool to encourage strong viral circulation. - Sharpe Partners (Jan 2006)

Eighty-eight percent of respondents reported forwarding jokes or cartoons. - Sharpe Partners (Jan 2006)

The second most popular category was news, as 56 percent of the group attest to forwarding such material. - Sharpe Partners (Jan 2006)

Health care and medical information came in third--32 percent - Sharpe Partners (Jan 2006)

Religious and spiritual material--30 percent. - Sharpe Partners (Jan 2006)

Twenty-five percent of those surveyed said they have forwarded content related to video games. - Sharpe Partners (Jan 2006)

24 percent said they have forwarded business and personal finance information. - Sharpe Partners (Jan 2006)

89 percent of respondents said they actively share content with others via email. - Sharpe Partners (Jan 2006)

Sixty-three percent of the respondents reported sharing content at least once a week. - Sharpe Partners (Jan 2006)

25 percent sharing daily or almost daily. - Sharpe Partners (Jan 2006)

75 percent who reported forwarding content to up to six other recipients. - Sharpe Partners (Jan 2006)

The most likely representative person to share content--and share it widely--to be a woman in her late thirties to early forties living in the southern United States or in the Midwest. - Sharpe Partners (Jan 2006)

Sixty-four percent of the female respondents said they shared content at least once a week, versus 58 percent of the males. - Sharpe Partners (Jan 2006)