For those that are security conscience you can calm some of those fears without having to install Windows based security applications like AVG Avira Avast Norton Comodo Online Armour and the list goes on, and its easy..
You can get applications I'll name two Site Block and Adblock Plus can be obtained in either Firefox or Chromium are two i use. In Site Block here's an example of how to load it up you can find these and other pests by way of Google..
In Adblock Plus I'll give you two that i use..
× Enabled Fanboy's Adblock List Last updated at 13:56:29 on Sunday, November 04, 2012
× Enabled Malware Domains Last updated at 16:04:33 today
I use my stock gufw Firewall.. The way i hear it we don't have much to be concerned about because of the way Linux is built. This is but a small example go ahead and be creative, i didn't know where to post this my apologies if its in the wrong forum..
Adblock Plus.. https://chrome.google.com/webstore/deta ... cddilifddb
Site Block.. https://chrome.google.com/webstore/deta ... ebopinlclj