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I believe I've seen a ground swell of new members registering with suspiciously closely related names ( over the past couple of days ).

It seems to me they are most likely aliases for spam-bots...

Another approach ( though a mite more drastic and arbitrary ) is to lock the LHF front door for a while ( don't allow any new members to sign up ).

A while could be translated into a...

Hi,

Perhaps a solution ( or two ) to the growing problem of spam is to institute a 7-day waiting period for new members ( before they can post ).

Or put all new members into probationary period...