UKP has grown, it's not only lurkers that read the topics. I'm sure journalists, mumsnet members and others fascinated or appalled with punting activity read topics on this site.
Info you share can be gathered. Where you live or work, which team you support, which party you voted for, how old you are, how many kids you have etc..
When sharing info via PM's - it's ultimately your decision what you share but be vigilant about sharing your number/e-mail and whether you have whatsapp linked to the number and the picture/nickname you have on there.
AW - I don't use AW to contact girls but those who do may choose to use a different name than their UKP ID and try not to link it. If a girl asks you to email her privately then use a punting email not connected to your real name.
Twitter - I didn't even realise this was used to contact WG's until recently. Again follow above steps.
Phone - Probably the most important security aspect for organising a punt and the easiest way to discover someone's identity. Use a punting phone. Disable/delete any apps such as facebook, whatsapp or any other social media and contact apps, or just use a non-smartphone.
Never tell someone your real name or where you live. Make up a story about what you do for a living. Keep your belongings and things that can identify you safe. Either at home, in the car or if you choose to go in to a WG's flat with them, don't go showering while they are left in the room. A nosy WG can find out your identity. They may not do anything but it only takes one psycho to start blackmailing you.
Most of this is common sense and not a James Bond movie.