giving out personal information.
The first, which I ascribe to, is to give any and all info that a gal asks for up to and including home address, phone number, and work info. The underlying idea is that by doing so, you are creating a large comfort factor for the gal, and she will be more interested in seeing you. The down side is mitigated by her excellent record and reputation. Yet, the downside exists. Every so often there is a complaint that some gal with a great reputation tries to pull a fast one and blackmail or otherwise use the client's personal information against him. Bottom line: There's always a risk. (I could add that we only hear one side of these stories, so they are not totally verifiable.)
The other is to give out zero information, except to perhaps a screening agency like P411, and except the fact that you won't get to see a certain number of gals, but you can rest easy knowing that they have to way to use that information against you. The downside of course is that you still leave yourself open to being busted because LE doesn't do screening. Of course, if you limit yourself to gals with reviews, that risk is mitigated, but it isn't zero.
So, choose the philosophy that feels best to you. I can say that I've seen over a hundred gals from the internet, and never had any issue with my personal info being compromised. The only two situations where things did go wrong was as a result of gals I met through MPs.