I'd not thought of doing this before but it does seem like an excellent way of getting a look at another society. Sure, we're all familiar with the notice boards in our own areas, but why not go and read a notice board or forum in another country.
You'll be able to see what it is that actually interests people.....not what they think you ought to know about their country, but be able to see into the real society.
For example, why not try this womens forum in India. We know that it's a very different society, of course, but with the advantage that English is the language of the middle classes....exactly those we might expect to find on such a forum. It's all really ratther fascinating, try this section on Indian recipes, or maybe this on bridal care.
There's nothing quite like being able to see what a society really talks about as a way of trying to understand it.