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Hi Fiumi,
Can you explain a bit the problem?
But if you are experiencing problem that lots of user registering like some kind of automatic process then I would suggest you to enable captcha at the time registering.
It will be possible from site backend admin panel
1. login at site administrator
2. go to components > jomsocial > configuration > site >Registrations > Enable Recaptcha [option] to yes
You need to register at
www.google.com/recaptcha/intro/index.html
and get recaptch private key, public key
Thanks