This week on Taking Stock Mandy Johnston talks to Stephen O'Leary of Olytico and Mark Corcoran of Taxback about how the Revenue Commissioners are starting to turn their attention to social media influencers.

 Mandy delves into the Russian security services' use of poisoning with Financial Times special correspondent Courtney Weaver.

Plus Joshua Oliver discusses his latest book, 'The Hype Machine; The Ultimate Guide to the Crypto Boom and Bust."