This question already has an answer here:
- Subscribe to user's activity 5 answers
If I want to follow a technology expert, it may be any technology, the how can I know a person and follow him for good answers?
StackOverflow does not have a follow or friend feature through which you can track someone's answers as it leads to unintentional gaming of the system. Well known people like Jon Skeet will get lots of followers very quickly, and hence end up getting a lot more upvotes on their answer.
However, every user gets their own RSS feed. You can find this at the bottom of the user profile. Yours, for example, is here. You can subscribe to this use any RSS/Atom feed reader if you want.