I didn't get Threads or Snapchat. So if you are proficient at it, share your experience/knowledge in the comments.
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I think that I "got" Bluesky and LinkedIn so one useful tip for each:
Bluesky – circle back to your best-performing post and contribute some comments because the Feed is chronological and that post will emerge again.
LinkedIn – the best performing for me are those where I share successful milestones.