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When you use Facebook chat to talk with someone, a Seen By confirmation is displayed in the your Facebook chat box once your friend on the opposite end has actually seen or read the message. The Facebook seen message also contains the exact time when your friend has seen the message.

Its a great feature as it confirms if your message on Facebook chat has been delivered. But its also a privacy issue. Sometimes, you may want to not want your friends’ to know that you have seen a Facebook chat message sent by them. But its impossible because as soon as you see the message, a Seen Byconfirmation will be displayed instantly in your friend’s Facebook chat box.

One of the most annoying issue with YouTube is the ‘sudden’ popup AdSense ads that appear while the video is playing. But there is no official procedure to disable, block or remove AdSense ads from YouTube videos, unless they are your own YouTube videos, because this is the only way Google makes the revenue from YouTube.

Tip: The AdSense ads on YouTube videos are not randomly displayed ‘suddenly’. They appear at the time when you see the small yellow point in the video progress bar. See the image above for details. If there are multiple yellow points on the progress bar of your videos, then it means the ad will be displayed multiple times.