Never give out personal information about yourself, which can be used for illegal purposes (identification numbers of your credit cards, home phones, motor vehicles)
Man or woman who wrote to you over the network is not always the one who he claims to be. Always check for other channels of communication with whom you correspond, for example by telephone or in person
The first meeting is safer to appoint a public place
If someone wants to join your group, check it out before you give the authority to review the personal data of other users
By sending a request to join the group you have a critical analyses personal information submitted. Perhaps Group Manager is not used as you expected, for example to send promotional messages.
In accordance with the laws of Group Founder personally liable for the safety of personal data of members of the group
The owners of the system shall not be liable for the wrongful use of your personal information by third parties.
Remember the security of your life and privacy depends primarily on you. It is not necessary to hope that none of people do not know any thing if you informed about yourself tens of millions of users by yourself