Although this service has a high Alexa ranking and reports to support millions of forums, we found much of their information outdated. For example, their news is old and many forums are inactive. However, the service still works and you can set up a new message board easily and the service is free. Our free forum included Google ads but did not have pop up ads and we did not receive spam posts.
This service hosts forums on their servers. You can select your forums color scheme, add logos, configure buttons or change styles. It supports good posting features like BBCode editing, smilies and polling. You can also upload files and images and create profiles and buddy lists. Administers can adjust display options, the number of posts shown, block users, archive messages, track messages and more.
However, since InvisionFree is free they offer little customer service beyond a bit of online information and a user forum.

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