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- In Memoriam: Tumblr Things Lost in 2015
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- Reblog Chains (2007-15)
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- Reblog Edits (2007-15)
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- Meetup Kits (2009-15)
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- Tracked Tags (2009-15)
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- Replies (2010-15*) *Replies may return
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- Reblog As (2010-15)
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- Featured Tags (2011-15)
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- Yosemite App (2014-15)
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- Coppy (2015-2015)
Tumblr In Memoriam 2015:
Take a moment to reflect on Tumblr things lost in 2015.
- Reblog Chains on the Dashboard (2007-2015)
- Reblog Caption Edits (2007-2015)
- Tumblr Meetup Kits (2009-2015)
- Tracked Tags (2009-2015)
- Replies (2010-2015) — but post replies may return
- Reblog As, especially “as link” (2010-2015)
- Featured Tags (2011-2015)
- Mac OS X Yosemite Tumblr App (2014-2015)
- Coppy (2015-2015)
So like…90% functionality?