Family Networks promises to be a very useful,and unique, feature - by providing only your DNA sample, sex and birth date (which does not have to be exact), Living DNA plans to show your DNA matches in an ancestral tree. The date of birth is required to help separate first cousins from aunts, uncles, nieces and nephews. The key seems to be having as many close relatives as possible, on both sides of your ancestry, provide DNA samples. Details of Family Networks in action, can be found by clicking here.
Living DNA offers autosomal DNA testing, but they also (at least until 31 October 2018) accept raw DNA samples from people who have tested at Ancestry, 23andMe, MyHeritage and FamilyTreeDNA. If a lot of people take advantage of this upload opportunity, Living DNA could quickly become a "go to" site for determining how you relate to other DNA testers. Perhaps the hardest thing to figure out is how to upload your raw DNA sample to Living DNA, so I have provided a link to get to the right page quickly.
Once you have created an account and uploaded your DNA sample, you need to opt-in to Family Networks. To do this, click on "View Test" from the "My Tests" option on the home page.