From Wikipedia's description of a forum:
An Internet forum is an online discussion site where people can hold conversations in the form of posted messages.
From Wikipedia's description of a blog:
A blog can be an informational website consisting of discrete, often informal diary-style text entries ("posts").
HASnotes allows two way conversations because any member of the forum may post messages on topics they choose.
Postings are one-way notices on the HASmember Blog because only a few people do the posting.
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