My Path is still fairly new and has just 422 members.
You may ask what the point of this site is, when you have facebook.
From what I can see so far, MyPath gives you the ability to search for friends based a specific set of Pagan qualifiers, such as “druid, eclectic pagan, wiccan, asatru, voodoo, etc.” So already their search mechanism is more useful than facebook in terms of finding like minded accomplices for trouble.
This site also gives you the ability to check out different groups, events and blogs.
So check it out.