Apparently Yahoo! is set to publicize everything you do online to all your friends. If you're not excited about this thrilling change, you can opt out with a single button click (so they say), but it doesn't say where or how.
I logged in with an old account and here's what you're looking for:
Once you click that, here's what you'll see:
Click the checkbox and you should be good until the next major settings change they hope you don't notice.
Note that I clicked around a bit and eventually I did get a screen that warned me about the change and let me opt out. Even if you see that screen, it's not a bad idea to follow the directions I listed above just in case. Anyway, here's what the alert looked like:
Make sure to uncheck each box here the click "Get Started"Tags: Internet, Yahoo