From March 1st, Google will be able to view our web and search histories and use them against us. I suggest you do what i did and delete (and pause) your web history on the google+ network (which includes stuff like youtube too). I'm not too certain on what they can actually use your information for, but if you like keeping things private i suggest you do it.
If you don't do it by March 1st, you can not opt out of it, you have no choice in how google records or uses your information.
Here's a link showing how
This thread is probably useless, but i felt the need to post it just in case it could actually help someone