People don’t always play nice on Twitter - but users of the social media site have shown how it can be used for really great causes too.
Using the hashtag #Match4Lara, people are desperately trying to find a stem cell donor to help a young woman with an aggressive form of blood cancer.
A huge number of users, including actor and comedian Stephen Fry, have tweeted pleas for people to sign up to the national bone marrow register to help 24-year-old Lara Casalotti.
Casalotti, a student from London, was diagnosed with acute Myeloid Leukaemia at Christmas and desperately needs a transplant.
Her situation is more complex than others, however, since she is of Thai-Italian heritage and only 3% of donors on the public register are of mixed race heritage.
Her brother, Sebi, had hoped to be her donor but unfortunately was not a match.
He explained: “If we had had some luck this would have all been easy and I would have been a match, but unfortunately we can't always be a donor for the people we care most about because of the genetics of it.”
As Casalotti undergoes intensive chemotherapy at London’s UCL Hospital, her family has issued a desperate plea for more people, particularly those of mixed race heritage, to sign up to the register - and Twitter has taken up their cause…
Please Help Lara find a Match by April. Retweet! Thanks in Advance!!!January 8, 2016
The Match4Lara Facebook page had also received over 6,000 likes at the time of writing.
Registration to become a potential donor is quick and easy and simply involves spitting into a tube.
Blood cancer charity Anthony Nolan explains that 9 out of 10 people donate stem cells in a quick and easy process similar to giving blood, called peripheral blood stem cell collection. 1 in 10 donors will have their stem cells collected via the bone marrow itself, while under general anaesthetic.