The latest four-pack of tech news stories from David Bradley

• How to interpret your credit card number – Your credit card number may look like a random string of 16 digits that is unique but those digits reveal a little more than you might think.
• Mflow is a snazzy new music discovery Web app – Mflow is a new music discovery app I came across in the Chrome Web Store — though as with many “apps” there, it was little more than a bookmark with a pretty icon. In truth, the mflow (yes, it’s all lower case…) beta works in any browser.
• DNS Performance test – Switching your ISP’s DNS servers for OpenDNS can help you control your connection to the internet, avoiding phishing attacks and cut the risk of being spoofed. But it may not be any faster than your ISP’s DNS. This download lets you test your DNS lookups to see for certain one way or the other.
• 5 Tools to discover hot Facebook content – Does what it says on the tin. Tools to help you find the stuff that people like most on Facebook. Not a scam. Actual tools.