Is facebook monitoring everything we do on the internet? Whenever I search for a product or service when I go to my facebook timeline I see ad posts for the stuff I searched for. Is this normal?
It's not just Facebook. It's pretty much everything.
Didn't you notice that you do not pay Google for maintaining that search engine? How do you think they pay for all those servers, databases, and crawler bots? They keep track of every search you do and sell that information to marketing companies. If you visit almost any web site, chances are that they're collecting information on whatever you do at their site and sell that information to marketers.
Remember the old adage: if you're not paying for the service, then you're the product being sold.