If there is interference on the wifi channel the range will be short. Best range is usually 75 ft. when no interference. Worst source of interference is usually wireless DMX dongles like the Donner wireless DMX.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .