Because of the much initial labor in the building of a blog, many lazy people suggest that it is better to create a forum, which requires less labor. This is a misconception. Most successful forums on the web are products of spontaneity.
They grew because users or subscribers found particular passionate interests in the subject being treated by the forum. It takes 5 times more effort to write than to read. Many web surfers prefer to ‘read and go’, than writing to contribute their 2 cents.
If they would write, at all, it must be because the issue is sufficiently passionate to warrant their written contributions. That is why the population of blogs to forums in web space is like 1,000 to 1. Meaning you would have seen 1,000 successful blogs before you come across one successful forum.
The web space is full of dead forums than you can imagine.