City-data.com is an amazing site with a highly active forum. It has a huge following and as far as I can tell, is THE best geography forum on the internet. It also ranks very high on Alexa, which is interesting for a 'hobby' site. I think it is also used by people who are not interested in geography but use the practical and extensive data on every city in the United States when relocating or moving. There are thousands of threads on obscure topics and a lot of practical questions as well. Of course, there is also plenty of pictures as well. Good site, go.
-Best Geography Blog For Educators