Eng:Will Scratch ever get private messaging?

No. Private messaging, and also chatting, goes against Scratch's model of having all site activity public. This has been suggested, and rejected, several times.

Private Messaging, sometimes abbreviated as PMing, and also chatting, are commonly proposed suggestions on Scratch by numerous Scratchers. Private messaging and chatting have been constantly rejected by the Scratch Team, and will not be added.

Pros

 * Allows Scratchers to collaborate more easily on projects
 * Would allow certain important messages (such as a notification that one's Scratch Wiki account has been approved) to be harder to miss
 * Often children's parents block popular messaging services and websites with features such as this one; this would allow the child to use a trusted website to private message
 * A lot of people want this feature, so it would please a lot of people.

Cons

 * It would be nearly impossible to moderate the massive number of messages people would send to each other
 * The website wasn't made for the purpose of private messaging; other websites can be used
 * It goes against the "sharing" aspect of Scratch, having everything public gives a sense of community spirit, whereas if people could communicate privately, this would be ruined
 * It allows people to be mean and bully more easily without letting other users notice
 * It allows people to gossip about other users
 * It goes against the general rules of internet safety, especially since Scratch is a website meant for minors
 * It would greatly increase the amount of spam and wasted server space.

Alternatives
Instead of private messaging, one can use instant messaging services, such as Skype. Alternately, Scratchers can use their emails; however, giving away contact information on Scratch is against the Community Guidelines. People can also contact each other using social networking sites such as Facebook or Twitter. Also, in Scratch 2.0, you can talk directly to someone via their user profile page, although this is public.

NEVER give out personal information to anyone on Scratch, no matter how friendly they seem. You can get banned if you do this. Additionally NEVER meet anyone online for the first time without a trusted adult present.