Celebrities from Hollywood stars to sports personalities joined in The Big Tweet for Missing Children.
A 24-hour tweetathon was launched on Thursday (May 25) to coincide with International Missing Children's Day.
Led by UK charity Missing People, this year's The Big Tweet includes appeals for children missing from west London.
The 17-year-old from Hammersmith disappeared more than one month ago.
According to Missing People he was last seen on April 22, 2017
Missing People reference number: 17-002440
Teenager Sarah Obikwu has been missing from her home in Westminster for more than a month.
The 17-year-old has not been seen since April 16, 2017.
Missing People reference number: 17-002582
Ibrahim from Ealing has been missing since the beginning of the year.
The 17-year-old is reported to have disappeared on January 15, 2017.
Missing People reference number: 17-002423
Other children on the list include Madeleine McCann who has been missing for a decade, since she was last in Portugal in May 2007.
The aims is for anyone and everyone on Twitter to retweet appeals which are going up every half up until midnight.
The hope is someone will see the appeal and help find a missing child.
Jo Youle, CEO of Missing People said: “On International Missing Children’s Day, a day marked on the 25 May every year, we ask people to help find every child.
"These are some of the most vulnerable children in our society. By joining the Big Tweet everyone can do something practical to help and to put social media to good use.
"The tragic events in Manchester this week meant that many people experienced not knowing where their child was in the most horrendous circumstances.
"We hold those children and their families in our thoughts. For the families of other children, those missing and featured in the Big Tweet, we hope we can bring happier news during such a sad week.”
The Big Tweet 2017 is being supported by players of People’s Postcode Lottery.
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