... is a hashtag (#friendshostfriends) and a new way of looking at the social Internet.
If you don't feel up to hosting your own Friendica site (strongly recommended and very easy) the next best thing is to join a site you can trust almost as fully as you would trust your own - because it's run by a friend.
So if you are good friends with someone who has a Friendica site, why not ask whether you can join it? Private sites are generally preferable to public servers and sometimes also more powerful than community servers run by clubs or schools. Reason: With less users to cater for, they can unleash the full power of Friendica and its many addons/connectors. See here for more.
And if you're the admin of your own Friendica site already? #friendshostfriends - you've got space for your buddies, haven't you?
Find some advice on that here.
Of course, we also have an even better hashtag for you: #friendshelpbuild - let your family and friends know that you can help them set up their own Friendica sites, too.