Apart from searching for content on your blog and being able to comment on posts, you must also give your readers a means to contact you whenever they have to. You will notice that some will even submit content to you, make very useful suggestions and give tips. But don’t expect the messages to be all good. Some could be abusive, and you just need to ignore.
If you find any serious threat from these messages, don’t fail to contact the police.
The contact page could be just email and phone number. You can use Captcha to reveal them, to abuse spam.