London:  The social networking website Facebook can be used to track people's sleeping habits by building up a database of when your friends were seen last online busy chatting or "liking" posts on Facebook, a media report said.

"Many people visit Facebook as the first thing in the morning and the last thing before going to bed. It is, therefore, possible to get a good impression of their sleeping habits," said San Francisco-based software engineer Soren Louv-Jansen in a Mail Online report.

For the study, Louv-Jansen used "time stamps" from Facebook's Messenger service to see when his friends were asleep.

He was curious to see where the "last seen" data was coming from and after doing some research, he found a list of his Facebook friends' user IDs and last activity "time stamps".

This, he added, is embedded in the initial mark-up of Messenger.com and can be viewed by simply visiting the website and clicking "View Source" to see for yourself.

"By creating a simple service that checks Facebook every 10 minutes, I'm able to get an accurate picture of my friends' Facebook usage," said Louv-Jansen, who published the programme's source code onto GitHub.

GitHub is used by many developers and hackers to put large amounts of information for developer communities to see and take advantage of, the report said.

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Facebook earlier this month started rolling out its Live Video streaming feature to countries other than the US. The feature was at first limited to select iOS users and celebrities and was later rolled-out to all the iOS users in the US. Now the social media giant has announced that the feature will be additionally rolling it out to 30 countries however, it did not specify which ones. The company added that the feature will also be arriving to Android devices starting next week.
The social network will be rolling out the Live Video streaming feature to its Android users in the US followed by other countries soon. In addition, the feature will continue to roll out to Facebook Pages as well in the coming weeks. The company in the blog post stated that, "more than 50 percent of people watching live videos are using Android devices."
Users can check if they have the live streaming tool by tapping on the Update Status bar at the top of the News Feed and looking for the Live Video icon. Facebook Live Videos work in a similar fashion as Twitter's Periscope. Users can start streaming a live video and the viewers can comment and like the stream. Facebook will also show the number of views on the live streaming video.
Last week, Facebook rolled out its Reactions emojis worldwide. The emojis that the company started testing in October last year show: "love," "yay," "wow," "haha," "sad," and "angry," and are similar to regular emojis used in chat. The Reactions emojis are already available in Spain, Ireland, Chile, Portugal, Philippines, and Japan.

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