Purpose – The purpose of this paper is to review sources of information on cloud computing. They include reference to an unexpected application to social care and to work that demonstrates vulnerability of cloud systems to cyber-attack. Online discussion of Stafford Beer's Cybersyn project in Chile is also reviewed, the discussion initiated by the appearance of a new book (Medina, 2011). A note is added about developments in Colombia. Design/methodology/approach – The aim is to review developments on the internet, especially those of general cybernetic interest. Findings – Cloud computing is undoubtedly valuable, though the susceptibility to cyber-attack is a serious drawback. The discussion of Cybersyn focuses mainly on the overall interplay of political and scientific considerations rather than on the potential practical value of the project, though naturally that is also a significant aspect. Practical implications – Cloud computing is a valuable tool, especially where services are subject to uneven loading. Vulnerability to cyber-attack is a serious problem that needs attention. The recently-published book has aroused fresh interest in the Cybersyn project and the associated Viable System Model, even if their evaluation was a side issue. Originality/value – It is hoped this is a valuable periodic review. [ABSTRACT FROM AUTHOR]