Social Media

The Register – @TheRegister

https://twitter.com/theregister
Twitter profile: Biting the hand that feeds IT. Technology and science news for world+dog. 
Follow us: Science and technology news for the world

Tripwire, Inc. – @TripwireInc

https://twitter.com/TripwireInc
Twitter profile: The leading provider of advanced threat, security and compliance solutions to confidently detect, prevent and respond to cybersecurity threats
Follow for: News. Trends. Insights.

Naked Security – @NakedSecurity

https://twitter.com/NakedSecurity
Twitter profile: Award-winning security news, opinion, advice and research from Sophos
Follow for: Security Industry news and views

CREST – @CRESTadvocate

https://twitter.com/crestadvocate
Twitter profile: CREST is the not for profit professional body representing the ethical security testing & cyber incident response industry
Follow for: Industry news and events

Dan Rosenberg - @djrbliss

https://twitter.com/djrbliss

Twitter profile: I break kernels

Follow for: Security Researcher interested in reverse engineering. Updates on hacking and vulnerabilities in mobile.

LinkedIn

InfoSec Careers (Information Security)

https://www.linkedin.com/groups/1364287/profile

InfoSec Careers is dedicated to connecting Information Security and Cyber professionals interested in a new permanent career opportunity or contracting jobs with specialist recruiters and hiring managers looking for new talent. This is THE LinkedIn Group for Cyber & Information Security Jobs and all those interested in IT Security news from industry.

This group is specifically relevant for those professionals holding CISM, CISA, CREST, BS7799 / ISO27001 Lead Auditor, CISSP, GIAC, PCI QSA, CRISC, CLAS or similar certifications.

Type: Networking Group
Members: 9,120 

SC Magazine UK (Information Security)

https://www.linkedin.com/groups/1833658/profile

This group is open to professionals working in information security and risk management and is affiliated to SC Magazine and SC branded events including conferences. The SC brand provides information and intelligence for professionals working in information and organisational security.

Its followers include FTSE 100 CISOs and CSOs who are relied upon to protect their businesses from the wide-ranging data threats that exist in the world today.

Type: Networking Group
Members: 6,334

Information Security Group (ISG) RHUL Official

College & University

The Information Security Group (ISG) at Royal Holloway, University of London, is a world-leading interdisciplinary research group dedicated to research and education in the area of information (cyber) security.

https://www.facebook.com/ISGofficial/timeline

Blog

Google Online Security Blog

http://googleonlinesecurity.blogspot.co.uk/
News and updates from Google

Security Bistro

http://ddosprotectionblog.corero.com/blog/
IT network security and DDoS security news. Email security, cyber security, spear-phising

Krebs on Security

http://krebsonsecurity.com/
In-depth Security news and investigation

Security Bloggers Network

http://www.securitybloggersnetwork.com/security-bloggers-network-the-feed/ 
The Security Bloggers Network is the largest collection of information security focused blogs and podcasts in the world. Of the almost 300 different blogs and podcasts included, each one has requested to be included in the aggregated feed.

SecurityWatch

http://bhconsulting.ie/securitywatch/
Brian is recognised internationally as an expert in the field of information security and has worked with numerous companies in the private sector and with government departments, in Ireland, Europe and throughout the United Kingdom. Brian has also provided advice to the European Commission on matters relating to information security. He is also on the advisory board for a number of innovative information security companies.

Graham Cluley

https://grahamcluley.com/
Graham Cluley, public speaker and independent computer security analyst. He is an independent blogger and talks to the media about computer security issues, speaks at company events and conferences. He has given talks around the world at events such as RSA, Infosec, Web Summit, EICAR, AVAR, ICSA, ISSA, Virus Bulletin, Ja.net, Campus Party and the European Internet Security Forum.

ConCon Blog

http://www.contextis.co.uk/resources/blog/
Contains news and detailed analysis of research projects and recently discovered security vulnerabilities from Context Information Security.