After you have posted ten times, you can send Private Messages to other members. This is like sending an email, though the person receiving the message will not see your email address, just your username.
This way, you can communicate privately, so if you want to exchange emails or Skype, ICM, etc details, you can.
Any harassment, inappropriate usage, advertising, etc will result in the person being banned.
If there are problems or issues about the forum that you wish to discuss privately, feel free to send a message to one of the moderators. Please don't send language questions; these should be posted in the forum.