What is shared psych D/O?

Can moderator or someone please explain what this is?

Thanks

When someone is in a relationship with another person who experiences delusions, the partner will share and believe the same delusion.

http://www.clevelandclinic.org/health/health-info/docs/3800/3842.asp?index=9601&src=news

damn thats trippy shit

That would explain some wierd events like the Koolaide suicides at Jonestown in Guyana, and other such tragedies.
http://en.wikipedia.org/wiki/Cult_suicide

Could this also spread beyond folie a deux to entire groups of people adopting false belief systems regardless of all evidence to the contrary?

http://en.wikipedia.org/wiki/Mass_hysteria

How does shared psychosis differ from two individuals who experience similar delusions? For instance if two individuals have schizophrenia, then they may likely both feel persecuted and reinforce this belief in each other. Is that the same thing as shared psychosis? Thanks.

Moss

What about people who become involved with delusional support groups? Web sites like http://www.stopeg.com/neighborsmurderers.html?