According to a report in The Sunday Times, "Pop-up" sex clubs were discovered in Cornwall, Cambridge, Swindon and holiday cottages in the Peak district.
According to the agency, web companies have become the "key enabler for the sexual exploitation of trafficked victims in the UK".
"People are using the Internet and social media sites to enable sexual exploitation and trafficking," Will Kerr, the NCA's Head of Vulnerabilities, was quoted as saying.
"It is clear that the internet platforms which host and make a profit out of this type of material need to do more to identify and stop these forms of exploitation," Kerr added.
According to Sheryl Sandberg, Facebook's Chief Operating Officer, sex trafficking - particularly of young girls and boys is one of the most heinous acts that takes place anywhere in the world.
"We all have a responsibility to do our part to fight this. That's why we at Facebook support efforts to pass amended legislation in the House that would allow responsible companies to continue fighting sex trafficking while giving victims the chance to seek justice against companies that knowingly facilitate such abhorrent acts," she said on February 26.
"Facebook is committed to working with legislators in the House and Senate as the process moves forward to make sure we pass meaningful and strong legislation to stop sex trafficking," she added.