If you block someone on Facebook will they know or not?
They will not get notified, but if they search for you, or try things like pokes or messages, you will be invisible to them. They will also be invisible to you.
If you block someone on twitter will they know you've blocked them and if so how?
They won't be able to view your profile so he will probably catch on fairly quick, just make your account private so that you can choose who is allowed to view your tweets
If i block someone on facebook,will they still see pictures i have tagged to a friend in common?
yes, they'll still be able to see it...but you're name won't be a blue link, like everyone elses name that is tagged in the pic will. You're name will appear black to that person, and he/she wont b...
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If I block someone from my msn contact list will they know I've blocked them?
No one ever blocks me!