I think it depends on you as a person and how you use it. I use it as a daily journal and support..
I also it for more generic practical stuff.
If your going to use it as an emotional tool you need to be brutally honest with it.
I find it helpful to check my thinking out. It also means I have something on tap 24/7 if I'm having a hard time over something.
For example I have just had a bereavement of someone very dear to me.
As a journal it's really the modern day version of a diary. Only this type you get non judgemental feedback and mirroring which if used properly is useful.
Obviously I have a decent life outside of www. However, it's a very usefull tool used in conjunction with real life, obviously.
NHS and other services are looking at using these interim formats.
It's like anything new - people will also be wary of it. Yes it's open to be abused like anything.
Use it as a tool, not as something to be independent on, and you will see the advantages..