If you visit many different programming sites and come across problems you'd like to solve later, and forget about them later, consider giving my chrome extension : Upsolve tracker a try.
Upsolve tracker lets you
mark problems for solving later across various sites
also lets you add tags to the saved problems
view your pending and solved problems at-a-glance in your dashboard
reminds you the number of pending problems via a badge on the extension icon.
More features such as activity graph and alarm reminder are in the pipeline.
Suggestions/ Pull requests at github repo are welcome!