What does it mean that all LinkedIn groups are private?

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This means that you can no longer read content shared by others in a Group , whether you are interested in it or not, if you are not a member of that Group . It doesn't matter if you as a Group Admin want anyone to be able to read the content, LinkedIn no longer allows this.
It means that even if you want to, you are not going to belong to 1000 groups just so you don't miss any news.
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It also means that this content is no longer being shown to the part of your contacts that do not match you in some of the groups in which buy algeria whatsapp number database you share content. In other words, your radius of influence is noticeably reduced.
IMPORTANT NOTE: This doesn't mean that participating in LinkedIn groups no longer makes sense, it's still important to get your content where the people who might be interested in it are and focus on your target audience, although given the reduction in your reach that you may have, it's also important to consider other alternatives.

Alternatives
The quickest way is to join more groups so you can increase your reach. You'll have to wait to be admitted, but the time it takes for the Administrator to accept your request will also give you an idea of ​​whether the group is actually moderated, or a group that someone created and never bothered to manage again. Unmoderated groups tend to be inactive or share content about absolutely any topic, so members may not be paying much attention to what is being shared because they have long since lost interest in many of the topics or open discussions.