LinkedIn.

Microsoft-owned professional networking platform

Facts

XING
German professional network and recruiting platform
DE · commercial
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Viadeo
French professional network (smaller footprint)
FR · commercial
↗
Akkoma
Fork of Pleroma with extra features for federated social networks
DE · open-source
↗
BookWyrm
Federated social network for tracking and discussing books
DE · open-source
↗
Diaspora
Decentralised social network with focus on privacy and data ownership
DE · open-source
↗
Firefish
Misskey fork with improved interface for the Fediverse
DE · open-source
↗
Friendica
Decentralised social network with support for diverse protocols
DE · open-source
↗
GNU Social
One of the oldest decentralised social networks, part of the GNU project
ES · open-source
↗