Hence, the texts are more complex in differentiation between the authors.
: a) the posts have a unified content (i.e., all posts are about infertility treatment); b) the same gender of authors (i.e., participants are overwhelmingly women); c) a small age range (most authors are 35-40 years old); d) the same geographic location (most are Canadians and a few USA); e) the same time of posting (2008 -2012).