In Profile / settings / Privacy you can you can change comment screening From Anonymous to Non-friends. Another option is non-friends with links This is a global setting
You can also only allow comments from friends.
And if you think it is a robot then set the Captcha which requires humans to enter a code.
You can also do some this for each message as you post it.
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You can also only allow comments from friends.
And if you think it is a robot then set the Captcha which requires humans to enter a code.
You can also do some this for each message as you post it.