I am starting a service on a website. I don't want it to be over ran by spam and scams so I want each user to be verified. I know nothing won't completey take it away but it will at least cut down on the number. I know there is the phone verification service is there another way or other ways that a user can be verified? Please help any ideas. Thank you
http://recaptcha.net/ might help you. I've no experience of phone verification, but flippa.com use it on their site if that's any help.