I just received a chat request from someone named
VALIDATION this person is not from steam support. Steam does not ask for account information through steam friends.
Never tell your password to anyone.
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Validation This is an automated message generated by Steam account administration to help us verify the validity of your Steam account ownership. Please respond with your account name, password, and
e-mail address which is registered to this account in the following format: [Account]/[Password]/[E-mail]. Failure to comply with this request will result in the immediate
suspension of your account until further notice.
Signed, The Steam Support Team
To contact us, email automation@support.steampowered.com
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EDIT: He has joined the nG community group to try and steal steam accounts. I would advice everyone not to answer his steam friends chat request or invite and to block him from contacting you.