Pull the blinkfeed down just a little until you see the menu dots (3 little dots on the right side) and open the menu and choose "Topics and Services"...check and uncheck whatever you do or don't want to see on your blinkfeed screen, then swipe to the right to "Services and Apps" and repeat. The blue boxes should be gone after that.
Thank you for the detailed response. I had already done this the very first day I got the phone, but just to make sure, I went through what you outlined again, and after refreshing the feed the very first time, the news item that popped up was a big blue "tips and help" box lol (see first attachment).
One thing I just noticed however is that under the blinkfeed pull-down menu, if you only choose the category on the bottom labelled "Apps" (see second attachment), then that's where all the tips and help items are categorized under - so we know that blinkfeed categorizes them as "Apps" stories. Unfortunately when you go into the "topics and services" and "services and Apps" menus, the "Apps" category isn't even available to deselect...
Thanks again for all the responses. If anyone has a proven solution for this it would be much appreciated.