#DonalWalsh is still trending in Ireland this morning following the airing of an RTE documentary about the inspirational teenager.
Donal, from Blennerville, Co Kerry, had been battling cancer since he was first diagnosed four years previously and last March wrote an impassioned letter to young people urging them to think twice about suicide and ask for help.
The documentary 'Donal Walsh -- My Story' was broadcast on RTE Two last night to such Twitter reaction that #DonalWalsh is still trending across Ireland this morning as more and more people log on to pay tribute.
O'Connell spoke of how he had become "firm friends" with Donal and said he had been inspired by him, while Paul Galvin said he thought Donal would have "made a great sportsman".
Bressie tweeted during the show that he was "honoured" to contribute to the programme and echoed Donal's message saying: "Remember, it's ok not to feel ok and it is absolutely ok to ask for help."
Donal's mother Elma succeeded in her efforts to get his name trending on Twitter, saying: "Come on we need to get this trending and known all over Ireland". She added: "He'll want to see this from Heaven".
Broadcaster Miriam O'Callaghan also took to Twitter to congratulate the programme makers on the "superb" documentary and described Donal as "truly inspirational".
To all a good night it really was a perfect night to have Donal my baby trending, he would be so trilled and I know he is skipping in Heaven— Elma Walsh (@Donal_Walsh_) January 2, 2014
Sile Seoige said: "What an amazing young man he was," adding that he had "a brilliant message".
The documentary is now available on the RTE Player.
See below for a gallery of some of the tweets about Donal following the programme.