Now operating in over 150 countries, they have noted the need to connect specific groups of people and offer a senior singles section.
Closer to home, giants such as have seen more than 10m members join in the UK alone since 2005.
In a more recent round, 280 applied and 173 of them left.
An HM Inspectorate of Constabulary report was highly critical of the 'poor' technology inherited by the NCA from Soca.
Several sources said top brass were frustrated that the Home Secretary, to whom they are directly accountable unlike in other forces, was using the NCA to fill gaps created by police budget cuts and had suddenly been given a lead role in tackling child abuse.
To see so many people at the very top of this organisation deciding to leave I think is a very serious matter.'RETIRED: After saying his NCA role was 'once in a lifetime', Deputy director-general Phil Gormley (right) will leave later this year while director of intelligence Gordon Meldrum (left) retired at the end of last year The NCA had to apologise after it took more than a year to pass on information from Canadian police about British paedophiles to local forces.
Simon Bashford, of the National Crime Officers Association union said: 'The NCA has made significant progress and members accept there are further challenges ahead.
The 50-plus generation find there are still many of the same stigmas associated with meeting people online as there are for younger generations. These are the same questions going through first dates' heads, no matter their age.
The NCA was set up by Mrs May and began work in October 2013 with a £500million budget, more than 4,000 staff and a remit to tackle organised crime, high-value fraud and online child abuse (file photo)There has also been an 'exodus' of more junior staff, however.
Last summer 376 workers applied for the Voluntary Early Exit Scheme with 262 leaving.