1.) The speaker is concern because he is trying to protect not just his privacy but his FAMILY.
2.)The trackers are following your history to give you adds that you will click on.
3.) Although tracking can be helpful and give you adds that are not as obnoxious but some of them can be very annoying. On my gaming computer I usually Google stuff about video games and I get a lot of video game adds.
4.)No not really because I have known about these things for a very long time.
5.)mine would be a lot bigger than the ones in the TED Talk because I use the internet more than anyone I know.