I am noticing that on most profile pages i see a "last action" line, says what time and day a person was here and what they are doing or if they have cloak mode....

But some profiles do not have this line available to see?

How does one have this info removed from their profiles anyway?

Also, I dont see this line on my own profile either, but I have done nothing to exclude it? Is it normal to not have this view for ourselves?