An article published by the Canterbury Suicide Project ("Suicide Pacts", Christchurch School of Medicine, New Zealand, May 2005) makes some notable comparisons between the nature of "traditional" suicide pacts and more recent Internet-related suicide pacts (or, as described in the article, "cyber-based suicide pacts"). It points out that, traditionally, suicide pacts have been extremely rare; usually involve older individuals (50–60 years old) and very few adolescents; and tend to be between individuals with family or marriage-type relationships and differing, but complementary, psychiatric pathologies. On the other hand, the growing number of Internet-related suicide pacts are almost the exact opposite: they involve young people almost exclusively; tend to be between complete strangers or individuals with platonic friendship-type relationships; and the common characteristic between them would seem to be clinical depression.
The article also points out that the trend of Internet-related suicide pacts is changing the way that mental-health workers need to deal with depressed and/or suicidal youngsters, advising that it is "prudent for clinicians to ask routinely if young people have been accessing Internet sites, obtaining suicide information from such sites, and talking in suicide chat rooms".
http://en.wikipedia.org/wiki/Internet_suicide