Sean MacEntee / Flickr

Andrew writes, "It seems like every week there's another scary news story about a big bank or a major company getting hacked. Is there any way to safely shop online, or should I just stay off the internet altogether?"

Ricky Romero / Flickr

Nancy asked, "I’m fairly new to Apple computers, and one of the reasons I made the switch from PC was to avoid viruses, hackers and other bad stuff. Should I install an antivirus program on my Apple laptop?"

An internet security breach of near biblical proportions is causing great concern around the globe.

David writes, "The other day I received a direct message on Twitter from a colleague of mine that said, 'Is this what you were talking about?' and a link to a web page. Like a dummy, I clicked the link. It took me to some random web page that didn't have anything to do with me. I messaged him back, and he had no idea what I was talking about. Then, I started getting messages from other friends on Twitter asking what I was talking about. Somebody hacked our Twitter accounts! What can we do to fix it?"