If you block someone on FaceBook then,?

[. .]

can they see your comments/activities thru common friends or public FaceBook pages. I have seen some people who have made their account private, but some of their activities are seen thru common friends and public FaceBook pages.
@Adam, thanks for the answer, but no, we cannot stop worrying. I have a cyberstalker who wants to show me that he is watching me constantly, so he updates his FaceBook page with topics that I discussed somewhere else.

[Adam]

The simple answer is no, unfortunately they could create another account or use a friends account, it's easier to just stop worrying about what they are gonna do and move on with your life

You give him power by focusing on it best thing to do is ignore him, if you choose to dwell on it I'm sure it'll continue and probably add too it, it can become dangerous and very serious, legally there's not a lot you can do, you could get a protective order but that's only a small roadblock

[SPYDERBLADE]

Block him. When you do that, you are invisible to him, and he is invisible to you. If he starts a new account, do it again. You can also file a complaint with Facebook, and /or the police.