I have only filled in parts of my profile and agree, sadly have to, with the advice of not disclosing too much of yourself on the net. I have used the Breast Cancer Care forums for friendship, advice and support but some of us were, are targeted with personal messages there.
A number of us received a personal message asking us for our bank details as the person sending us the message wanted us to have some money, a legacy left to help cancer patients. Of course we all knew it was a scam and flagged the message up but it was still not very nice to be targeted. And a few times I have had the odd private message there from someone offering a cure for a sum of money! Breast Cancer Care were, are very quick to act on reported posts and block the user but by then you have been sent, seen the message.