One of things that people are most concerned with when it comes to online dating is its safety. I'm not so sure why people are concerned over it as much as they are. Lets evaluate this a little further.
Ok. When you put a profile on net it is true that anyone can learn a little more about you. Of course that is whole idea behind it. There are still many things that these people don't know about you though. If you take right precautions they wont know following.
Where you live.
Your phone number.
Where you work.
Your works phone number.
Your full name.
There are also many other important things that they may not know about you as well.
You also need to keep in mind that going to a bar or on a blind date isn't especially all that safe either. Generally speaking any date you go on isn't that safe unless you have been friends for awhile.