My initial thought to this is no.  This can be discussed.  We want this to be private and I am not interested in giving Facebook my private information.  They already own too much private information.  I will be using Facebook to get more men for you to talk to though.

This applies to all social media outlets.  This site is not considered social media as it is all private.

Yes there is.  The app is made by jit.si and the links are
Yes there is, download the app from the 2 links from the previous toggle.  Follow the instructions in this video.  It is very straight forward. Make sure it is the same email address you use on the site.
The link to call someone is found in their profile at the top just above the tabs.  I have put a blue square around the link in the picture.  You are able to find your friend in the members list by searching or browsing.