i will use intimidating shout - On line dating site was introduced

They are now regularly used at the top level but their scope remains limited with referees only able to call for assistance in acts of scoring.

That could change later this year with the International Rugby Board having approved trials for reviews on other matters within the field of play.

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The system is also used in televised Challenge Cup ties, Australia's NRL and selected international fixtures.

The 15-man code paved the way for the introduction of the Television Match Official in 2001.

Wimbledon watchers will remember the bleeps of 'Cyclops', the infrared system which was used to detect whether serves were in or out and was introduced at the championships in 1980.

These days the showpiece matches utilise Hawk-Eye, which tracks the ball all over the court.

Initially, instead of a swiping motion, users would click on either a green "heart" or red "X" to select or move on from the photos shown.

As of October 2014, the app was processing over one billion swipes per day, producing about twelve million matches per day.

The NFL introduced a replay system in 1986 with an extra official used to review certain plays.

It was dropped in 1992 amid general feeling it had done little to improve the game but a new method of coaches' challenges was brought in seven years later.

When a challenge is made in the NFL, it is the on-field referee himself who will watch replays, under a hood, on the sidelines.

He must see clear evidence of an error and has 60 seconds to make a decision.

Rad has also stated that Tinder filled a gap for social sites for meeting strangers, rather than connecting with people a user already knows.

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