Many sites are basically brochures and nothing more.
Most sites are extremely light on content.
Be aware that most on-line bulletin boards are not used much. This designation is becoming obsolete as the historic sites are moved and renovated. This rating specifically means that the site contains links that make it part of the internet community, not just links to a closed community. There are a few top notch link collections outside of the search engine sites. Often they have webmasters who are demanding or obnoxious.