just a tip even if you are signed in as invisible and in those cases where it doesnt say when a person had last visited members can still know when a person last visited if that member has posted.

for example if my profile doesnt have a last visited clock on it then all other people need to do is click on find more posts. they will see when I last posted. so of course the assumption is well amandalouise posted yesterday so thats probably the last time she logged in.

I thought of another reason why there may be a last time you visited clock...mental disorders can mess up a persons sense of time, as can medications. having a clock system on a website helps those with memory problems and sense of time problems to know when their posts are made, did they log on yesterday or was it a dream or hallucination, ...