How do you know if it's a spam or not?

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Do you have any tips about knowing if a site is a kinda spam or not. I wanted informative response here so that other members would also learn about this sites and be cautious of what they're doing. Do you have any experience about spam sites? Pls share it with us, so that it will never happen again to somebody. I'm also a member on other autosurfing sites and it asks you to be a free member, after your membership has expires your balance will be on your account since your a free member but it will be added on your account and get paid after upgrading your membership. I trust this site and wanted to have a try about it. Have you ever be in sites like this?