A mobile social network: Zyb
Their homepage: https://zyb.com/
They started out as a service which enabled you to backup your mobile phone to their servers (usefull in case of a lost phone fi).
Now they have built a social network with the contacts on your mobile phone as a starting point > seems like an interesting point of view to me. Furthermore, this service is free as you can see here: https://zyb.com/info/help?pagemode=pricing
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