The WhatsApp description is not correct. It was changed about a year ago or so and now the two ticks turn blue when the message has been seen by the recipient. You can disable this behavior in WhatsApp to prevent senders from getting information about you having seen the message.
Peter wrote:
Both apps have an obvious privacy issue in that if somebody gets hold of your phone for a minute or two (needed to register the PC version of the app) they can get real time copies of all your messages on their PC, anywhere in the world
For this, Telegram offers you to show a list of all authorized stations with their IP, geographical location, operating system and last access and you can choose to terminate those sessions.
The WhatsApp description is not correct. It was changed about a year ago or so and now the two ticks turn blue when the message has been seen by the recipient. You can disable this behavior in WhatsApp to prevent senders from getting information about you having seen the message.
OK – I didn’t check the tick colour, but then why two ticks? They will always appear at the same time. It’s a bit like proving an email has been opened by looking at the SMTP log – all it will show is the transit time (a few seconds or less) to the destination SMTP server. There is no way to tell an email has been opened.
Telegram offers you to show a list of all authorized stations with their IP, geographical location, operating system and last access and you can choose to terminate those sessions.
I just knew you were up to speed on this 
I have just found it, eventually… most people wouldn’t.
Peter wrote:
I didn’t check the tick colour, but then why two ticks? They will always appear at the same time.
If you put your phone in a drawer, I will get two gray ticks if your phone has reception. Once you take it out and unlock it and WhatsApp pop up, the ticks will turn blue.
I don’t profess to be a specialist on this, but I do use WhatsApp regularly and from what I can tell you get the first tick once the msg is delivered and the second once it’s been read. This is between iPhones (only a handful of the people I interact with are not on iPhone, so not sure if Android is different).
No need to speculate, it’s all properly documented: http://www.whatsapp.com/faq/en/general/20951546
I have just done more tests on Whatsapp…
Sending messages both ways between my android S6 and the WP nokia 1020, you can cheat, and it works with both the android and the WP app. It’s a bit subtle.
If the app is showing the “front screen” (the one which shows multiple contacts) then an incoming message will appear on there, at the top. You can read just the first line of it. If you now long-press that message, you get the option of deleting the whole conversation. If you do that, the sender never gets the “read” indication
It reminds me of the uproar in the old Compu$erve system (shows one’s age!) when somebody discovered you could do this by sending an incoming (unread) message into the garbage bin and then retrieving it from there and read it. It was handy for some obnoxious people, especially since Compu$erve forced you to use the name on your credit card
You can actually deactivate the received /read indication in Whatsapp.
