There is a new EU site for tackling disinformation: http://www.euvsdisinfo.eu
The Politico website has some useful articles and information: http://www.politico.eu/newsletter/playbook
The European Policy Centre: http://www.epc.eu/
Brendan Donnelly, Director of the Federal Trust, has an interesting blog: http://fedtrust.co.uk/category/blog/eu/
Jon Worth has an interesting website with some good articles: https://jonworth.eu/