100% bounce rate on tag pages

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  David Jones: A website of mine has seen several traffic spikes in the last 30 days. At first I was very happy but then on closer inspection I noticed that a lot of the traffic increases were to tag & category pages and old blog posts and also the stats show zero time on page and 100% bounce rate. Is this just bot traffic and if so how do I stop it? I actually had a situation a few months ago where the 'c' language traffic shot up on this same site and now I have it filtered out in Google analytics so I have no idea what this traffic is now. I have looked at the traffic sources for these pages and its all 'direct'. I should point out that most of the pages look like they have real traffic with users spending time on them etc and its only some that have zero time spent and they are mostly tag pages.
  
  Should I be concerned about this?
  
  The site is Bloggingpro[dot]com btw and Ive attached a snapshot of the trafficed pages where you can see some of these pages with zero time spent, thanks.
• 
  Edwin Jonk: From the expert panel in this weeks SEO Questions hangout on air on 00:12:08 into the YouTube video: https://dumbseoquestions.com/q/100_bounce_rate_on_tag_pages +David Jones
  
  The cuetimes listed on this page are functional while the live broadcast continues and also once Youtube has finished processing the public broadcast. Processing time varies between 6-24 hours. During this period the clip is viewable in full but the cuetimes cannot be relied on.
  
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