Interesting Article: Internet Statistics

89% of adult Internet users in the United States share content with others using email. A full 63% share content weekly or more often.

Women; especially those women in their late 30’s and easily 40’s tend to be the biggest viral forwarders of content.

Note that "viral" in this context doesn't mean "virus" - it means they tend to replicate emails through forwarding.

http://www.sharpepartners.com/article/study_finds_consumers_fans_of.php?format=full