Depends what you want to do... if you want to be notified when user data is updated, then the action hook is fine (if you're not changing anything in the data payload itself).
Useful if you want to take the new user data and update another set of data somewhere else
I have a question : Can someone please point me in the right direction, to get this information?
In the acp, I am able to view the visitors and pageviews according to the time period, via the graph on the dashboard.
However, I am not able to see such a breakdown for user signups, topics, and posts.
Thanks for help