Real Madrid quickly deleted a tweet containing a racist handle on Wednesday after an initiative to automatically tag fan accounts in a video of Vinicius Jnr's Champions League winning goal last season backfired dramatically.
In a bid to promote their new app, Madrid pledged to tag the handles of certain supporters in a personalised post dedicated to Vinicius' famous strike against Liverpool, which sealed a 1-0 victory in Paris and crowned them European champions for a record-extending 14th time.
However, it appears the tweets were published using an automatic algorithm designed to pick out fans who had liked a specific post - a move the Spanish club were quickly left to rue when one user with racist language in his handle liked the necessary tweet.