Can I keep posts on facebook from being seen?

You can just delete them as a friend, easy as that! Anytime you're on facebook, click the "Friends" link on the top left corner of the page. Find this person (the list is in alphabetical order), and just click the "X" on the right side (it'll say "Remove Connection" when you put your mouse over it), and poof! They won't be able to do anything to your account anymore. I hope I helped!

It's not possible to delete other people's posts but you could always ask them to stop posting rude comments. The other way is to just delete them as a friend.

well you can delete them by going to "friends" then "all connections" and click the x next to that person.

there is a way to block but i cant remember it... :/

if you mean post status updates and things, then go onto your newsfeed and next to their post press hide

put them on limited profile. that means that they can't access certain things on your facebook or can't write things. it should be somewhere under settings.

select it as limited account

no