You.
You see someone online who’s expressing suicidal thoughts. How can you help? You’re no expert in suicide prevention.
You *are* an expert on your friends. You know when something’s not right.
Take them seriously. If you’re wrong, no big deal. If you’re right, you could save their life.
You might notice that these sites use language like “report” or “abuse,” which makes it sound like someone’s going to get in trouble if you reach out. This couldn’t be farther from the truth.
Behind every username is a real human being, and behind every social network is a group of real people who care about you and your safety.
Here’s how to get help for a friend on all the major social networking sites.
TUMBLR:
E-mail Tumblr’s support address with as much information about your friend as you can (e.g. Tumblr name, link to suicidal content, real life name, if known):

FACEBOOK:
Click here to express concern about anyone on Facebook:
YOUTUBE:
Click here to express concern about anyone on YouTube:

FLICKR:
To express your concern about a user on Flickr, click on the “Report Abuse” link at the bottom of the specific photo page:

This will take you to a form that will automatically submit the photo link and allow you to provide more information about your concern:

TWITTER:
Click here to file a ticket expressing concern about suicidal content on Twitter:
MYSPACE:
At the bottom of every page is a “Report Abuse” link:

Once you click on this link, a form will appear with a dropdown menu from which you can choose “suicide” as the topic:

YAHOO!:
According to Yahoo’s Safety Guide, most Yahoo! pages feature a Report Abuse link, which will open a form that you can submit with information about the suicidal information you’ve seen on their site. Here’s a list of where you’ll find them on each site:
Click here for the complete list of Yahoo! products and their corresponding safety pages.
Hmm. This could come in handy.