Sadly there are scammers, spammers, and general asshats invading almost every facet of internet life. My general rule of thumb is, if I don't know you personally then you aren't getting my name, address, phone number, or email address.
Although I do have one advantage. I run my own mail server so IF I want to give someone a chance I give them a unique email addy that is an alias for my main account. Then if they start spamming, I delete the alias and my main email remains in tact. I do this for every company, web page, etc. that I have to register for.