Whatsapp doesn't display last seen time stamp?

My Whatsapp application doesn't display the "last seen" time stamp. It shown when someone is online but then doesn't display the "last seen" time.
Does anybody else have the same problem?
:(
I use whatsapp for iphone.

ITunes.iCloud. How to delete on iPhone?

Ok so I don't want some songs on my iTunes library on my iPhone. I deleted them and they are still on my iCloud, when I try to delete them, it says archive, so where will that put the songs, and does the iCloud music take up space on my iPhone?

Iphone 3gs is bricked and the power button is broken, what do I do?

I went to check on my iphone and it a black screen so II tried to turn it on but it wouldn't work. (IT WAS 100% Charged!)

So I researched what could of happened and apparently it is bricked and I would have to get it into recovery mode, BUT I can't! My power button is broken.

Info:
It is charged
It dosen't respond to itunes.

Should I get a Macbook Pro or an iPhone 5?

Apple has been developing such great products. If I get excellent results for my exam, my mother said that she will give me a present. One major problem is; I can't decide whether should I get a Macbook Pro or an iPhone 5. What I know is that Mac is able to help me with my project stuff and it is very high definition and it is so cool, while for iPhone 5, I can download games with my eyes closed and call and message my friends and family so conveniently. May I ask your aid to help me decide? I would really appreciate it.

Does an unlocked iPhone 5 work anywhere in the world?

My parents gone travelling around the world and my dad called and asked me if i wanted an iPhone 5. I obviously said yes but he said his in Hong Kong at the moment and i was wondering if Hong Kong sells unlocked iPhone 5 and would it work with any sim card here in Australia.

IPhone Four stuck in reboot loop?

Please help me. I switched carriers the other day so I had to switch from my Android (which I never had a problem with) to an iPhone 4, because it was free on this carrier. I had it for a day and thought it was awesome, but woke up yesterday morning and saw that I could update to iOs 6. I thought I'd go for it, but it was taking a really long time, and we were soon leaving the house. There were like 300 more MB to go and I didn't wanna rack up data charges so I stopped it. It sounds stupid because it is, but I was super tired and thought nothing of it. I tried turning it on but it was stuck in a permanent loop where it would show the Apple logo and then fade out, then show the Apple logo, then fade out, and so on and so forth. So finally I got home last night at about 9ish at night, and I googled the problem, and after about an hour I found a solution, so I plugged the phone into my computer and it started restoring. It had an hour and a half left, and I had nothing to do so I went to bed. I woke up this morning, eager to have my phone back to working order, and checked the computer, which said it was done restoring. I unlpugged the phone and turned it on, only to discover it was stuck in that same loop. I really need some help. This stupid thing has been more trouble than help and I'm a heartbeat away from throwing it in the trash. I never had these sorts of problems with my Android phone. So if anybody can help me that would be great, cause I would love to actually like this phone, but so far I haven't had much of a chance. Thank you.

Added (1). Thank you very much for answering, but nothing really happened. Its just doing the same old thing.