The Office of the Data Protection Commission (ODPC) is now the first port of call for some 300m non-US Twitter users who wish to make a privacy or data protection complaint against the social networking giant.

Twitter’s Irish-based operation recorded a loss last year, as its cost base increased sharply following moves to double its workforce in Dublin.

The mayor of Waterford, Councillor John Cummins, has secured a High Court injunction directing Twitter to take down comments posted about him which the politician says are false and grossly defamatory.