It used to make both Dan and Tiffiny very upset, not because I was writing anything personal about them or our relationship, but because they felt like I was sharing more of my inner thoughts with the anonymous internet than I was with them.
The positive effect is mainly that it leads me to email threads with people I'm close to on a much more intimate level than we would otherwise communicate. I've gotten some very good emails recently because of that, but in theory I could have those conversations with my friends without using a public blog to initiate them. In practice I probably can't.
More : 11/2007 to 03/2008