Keeping track of the posts that have been read by each member would get way out of hand, and probably slow the site down. If you visit, and choose not to read a certain post, I think it's reasonable to assume it's because you're not interested in it.
I certainly don't want hundreds of Non-Bowling Related posts to keep showing up in my list of new messages every day, just because I chose not to read them!
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seadrive
Cogito ergo bowl