(4)The Private Message: I like Bitcointalk because your privacy is respected, you can communicate with any other member of the forum without third person knowing what you are talking about. The demerit of this is that, newbies cannot message other members, they are restricted by default but ranks above can make use of this feature and communicates effectively.
OP, if you think sending private messages, whether by a newbie or some other rank, is a handy feature, then I can warn you that you're wrong.
Sending unsolicited private messages to a stranger, and even more so, sending spam from a PM, can end very badly. There were cases when users marked such accounts with negative tags. Many will simply complain to the moderator, while others may simply block you so as not to receive any messages from you in the future.
This is a forum, not a messenger, in which two people communicate. Get used to asking without disturbing private messages. This way, you will get much more quick and complete answers.