WCPO: A California woman is in police custody after a social-networking Web site's users put a stop to her plans to kill herself.

The Silicon Valley, Calif. woman, known only by her user name, "Sandieguy," sent a micro-blog on Twitter to actress Demi Moore early Friday morning detailing how she planned to take her own life.

Sandieguy wrote at around 3 a.m. PDT, "Getting a knife, a big one that is sharp. Going to cut my arm down the whole arm so it doesn't waste time."

Moore reposted the message on her page and said, "hope you are joking."

Just moments later she sent out a tweet, "gbye ... gonna kill myself now."

That is when some of Moore's 370,000 Twitter followers jumped into action calling the San Jose Police Department.

San Jose Police Department Public Information Officer Jermaine Thomas told ABCNews.com, "We received several calls in regards to the Twitter threat."

"We located the subject and that person was uninjured. We did take the person into custody for evaluation," Thomas said.

Police say Moore had not been in touch with authorities. The actress did post an update on her Twitter feed reading, "It is my understanding that the situation was not a joke and that through the collective efforts here, action was taken to provide help."

Moore tweeted later Friday morning, "Today was a prime example of the power of collective consciousness and our incredible ability to create change when we come together!"

Ashton Kutcher, Moore's husband, also wrote about the suicide attempt on his own Twitter site saying, "Wifey reported a suicide attempt based on a at reply tweet she got and saved someones life. The woman is in the hospital now."

Thomas says the social-networking site could be a useful tool in police investigations.

"This Twitter concept is so new, this is the first time it's led us to what could have been a very real crime. This could be yet another tool to find out what's going on out there," said Thomas.

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