OzBargain equivalent websites in other countries?

I find OzBargain website very interesting. It's not just about social deal sharing but much more than it if you look at all features of the website including forums, coupons, polls and what not. A lot of members of the website are migrants from various countries and some are Aussies living in other countries. It will be interesting to know from everyone as to which websites from other countries would they consider equally great as (or greater than) OzBargain. It's important to note that every country has numerous listing websites but all websites can't be of the quality that we are referring to. So, list only those which you have personally used and you would value as much as OzBargain. It will also be nice to know how those websites differ from our OzBargain in terms of design, features, community, interactions, deals, etc. Cheers!

PS: Anyone can find the list on Google. It's not about the list. It's all about the above! So, try to be descriptive. :-)