There have been some attempts in France to create some more trustfully social networks based on open-source software and decentralized paradigm.
Here some of them:
- Movim, a kind of XMPP-based social network: https://movim.eu/
- Accounts for Mastodon and Diaspora instances from Framasoft by its "De-google-ify Internet" initiative: https://degooglisons-internet.org/en/list#tag-social
- Other ethical hosts defined by the KITTENS/CHATONS chart (full translation in English in progress): https://chatons.org/en
Be aware, even if you can self-hosting your own accounts, you have to consider how your "friend's" accounts are hosted.