T4R
I never seem to follow (or be followed by) anyone after the first few days the site went live, nor do I use hashtags, 'like' comments or start new topics based on comments.
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I like posts and threads. I know I'm following people but I never actually check what they've been posting, and sometimes people decide to follow me. I don't really make threads so I haven't used the Start Related Topic or Hashtags yet.