How much should you share online?

So I enjoy talking to people and hearing their stories. Some people write those stories down, and sometimes the stories are interesting. I came across this blog http://heathersbloggingplace.blogspot.com and actually really enjoyed reading it.

But where do you draw the line at what to share? If you have nothing to loose, share everything. People will find it interesting and you won't care if there are haters out there. If you do have something to loose, like a reputation, you may have to worry about things because people could use some of the self-incriminating stuff against you. Not everyone seems to be as accepting that everything you've done in your past has helped shape you into the person you are today. When you write stuff down, you can review it and learn from it. But what about when you share stuff about other people, like a name, where he works, and a picture, and this excerpt?

"When both of us were finally nude, we climbed onto the bed. Chris was very sensual, surprisingly sensual, actually. He knew both when, and where to slide his hands, and how to stroke with his fingers. I had an arm wrapped around his neck and we kept each other busy with kisses.

I know I eventually relaxed a little, but Chris seemed to remain pretty nervous. With me, nervousness will not necessarily hurt my performance, but with Chris being a guy, not everything operated exactly on cue. He said he was sorry but I told him that I was in no hurry and whenever he was ready, I was ready. I think my attitude seemed to actually help him relax because a minute or two later things began to happen."

I mean it's interesting to me to see the experience through her eyes, but if I went to school with Chris, I might be tempted to joke with him about it. I probably wouldn't, but other people might. 

Generally speaking though, I would like to write something like Heather does, and just say everything I am thinking about, experiences I've had, etc. ut I feel like I Bwould have to sensor my thoughts as I explore the what ifs I think about and stuff.

Here is something personal. I've been slacking on P90X for the past week. When 'Eye of the Tiger' started playing on my iTunes, I got up and did a silly pump up dance, about the same quality of a 4 year old's where all the parents start laughing, started typing this, and felt like actually doing the video. Then the music stopped.