Stop sending info to Goggle analytics, check in options,
I also have an add-on thats blocks sponsored results and Ads on Goggle search
Use Firefox for your browser
do not allow 3rd party cookies
get a good adblocker, adblock plus or similar
if you are on Faceache, search for FB purity, gets rid of all adverts and all the other useless stuff they throw at you
I do not get adverts while surfing the Net, just about everywhere