Please write a letter to your friend who is suffering from offensive commentary over the internet. The comments can be true or false. Nobody knows but your friend about the truth.

My dearest friend, (Dear ___________,)

->You can start with "My dearest friend" to make the word dearest an adjective that describes the word friend. If you want it to make it formal, you might as well start with "Dear" plus the specific name of the person.

I read some offensive commentaries on your blog.

->GOOD SENTENCE

I believe those things are not true.

->GOOD SENTENCE

As I experienced the similar situation, I would like to tell you this.

->add you to address the person / you can also say I would like to give you some advice.

First of all, ignore all the comments.

->use article the because you're talking about the specific commentaries which you deem offensive

I think most of the comments were written by an anonymous writer/person who doesn't know you well.

-> proper usage of article / emphasize the complete thought; anonymous is an adjective so it's better to indicate a word which it may define.

Therefore, do not care about them.

->GOOD SENTENCE

Second, if you don't mind, you can delete your post or make it a secret post.

->spelling of the word 

I hope you aren't hurt from this happening.

->GOOD SENTENCE

Regards,

KS

***Great job! You we're able to follow the instruction for this homework and I think you have the edge in writing. I just observed minimal lapses. I do hope that you find the grammar improvements helpful Thank you and may God bless you a thousandfold.