Twitter Accounts to Follow
@swiftonsecurity - the infosec twitter popstar we need and deserve. Seriously though, she posts relevant and helpful stuff all the time and has helped influence policy inside our organization through her tweets.
Sites to Visit
DecentSecurity - swiftonsecurity's site. Lots of good guides/info. General inspiration for this site.
VirusTotal - file/URL analyzer. Seriously if you have doubts about a site or file upload it here. Scans with 50+ AV engines and gives really detailed results.
Dark Reading - security/it news in general.
Reddit Sysadmin - news/questions/rants/ideas for systems administration.
Reddit Selfhosted - ideas and info about selfhosting your own servers/services.
Shodan - search engine for most of the ipv4 space on the internet.
SecurityNow - hosted by Leo Laporte and Steve Gibson (man behind spinrite and shieldsup). Generally security news and great breakdowns/opinion.
Techsnap - similar to securitynow but more unix/linux focused.