Just because you are paranoid doesn't mean that people really aren't following you.
The Third Place, unlike a physical café, is a bit different and you have to be aware of it. Things that you put on the web as opposed to things you say in conversation never go away. You can be haunted by things you wrote in a less-than-cogent moment for a very long time. And people do look -- potential employers, colleges, and who knows who else. Things can stay around for years. Even if you are successful in removing them from your place, who knows who else has copied them and referenced you in theirs? The bottom line -- if you don't want something you said or did resurfacing years latter to bite you, don't post it.