[deanhills]

I don't think you should worry too much about the security of Facebook messaging system. it should be secure enough for you to leave it open all day. I have many friends using Facebook messaging all days and they have no major issues so far.

I suppose it is more important that your computer itself should be secure, though.

Thanks for the positive feedback #tryp4vps  I've had it open for a few days now, so think it should be OK.  I am worrying about my computer since I'm not up to date with Windows 7 updates - had to roll back the last updates as they were conflicting with my VPN.  I've got MalwareBytes however and it's regularly scanning my computer and so far it's come up clean every time.  Hope this continues.