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A website is going to lose its members if there is no option to stop bullying messages. PRIVATE Message must only be only possible if both persons follow each other.

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Currently each user can turn off PMs entirely which goes some way to solving the problem.

But it's certainly a good idea to limit PMs in some way. One alternative to your solution would be allowing users to block other users.

I think both solutions would be possible via plugins - use a filter plugin and for each message you can check if each user follows the other.
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User blocking other user is much better, as it also solves the problem of user who do not want other user to share anything on his wall.
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