Ah! I'll sort through the archives.
Five years ago on July 18, 2008 - The 1st WGT blog post
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2008
October - Kiawah Island Resort - Ocean Course (front 9)
.................Bali Hai - CTTH
November - 1,000,000 rounds played. Amateur tier added.
December - 2,000,000 rounds played
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2009
March - Kiawah Island Resort - Ocean Course (back 9)
..............Kiawah Island Resort - Ocean Course - CTTH
..............Wolf Creek - CTTH
April - Bethpage State Park - Black Course - CTTH
May - Bethpage State Park - Black Course for US Open.
...........Pro and Master tiers added.
June - St. Andrews Links Old Course - CTTH
July - Edgewood Tahoe - CTTH
October - Pinehusrt #8 - CTTH.
................Match Play added
December - Bethpage State Park - Black Course 2nd set of hole positions added.
..................... Ready Go games added.
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2010
February - St. Andrews Links - Old Course (front 9)
...................St. Andrews Links - Old Course - CTTH
March - WGT/USGA long term agreement made.
June - Oakmont Country Club for US Open
...........Oakmont Country Club - CTTH.
...........St. Andrews Links - Old Course back 9
...........St. Andrews Links - Old Course 2nd set of hole placements added.
...........Pebble Beach Golf Links - CTTH
August - Tour Pro, Tour Master, and Legend tiers added.
................Levels added.
September - Celtic Manor Resort Twenty Ten course - CTTH.
.....................Blitz game added.
December - Alt Shot game added.
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2011
March - Hilton Head Island - Harbor Town - CTTH
..............Hilversumsche Golf Club - CTTH
April - Congessional Country Club Blue Course - CTTH
............Cabo Del Sol - CTTH
May - Congressional Country Club Blue Course for US Open.
...........Royal St. George's - CTTH
...........Cabo Del Sol
June - Royal St. George's for 18 hole stroke play.
July - Consecutive Days XP bonus.
...........Last ball reminder.
September - Oakmont Country Club 2nd hole placements added.
November - Skins Games added.
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2012
March - Olympic Country Club- Lake Course - CTTH
...............Chateau Whistler - CTTH
May - Olympic Country Club- Lake Course for US Open.
...........Chateau Whistler
August - Uneven Lie games added
October - Congressional Country Club 2nd hole placements added.
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2013
January - Challenge at Manele - CTTH
February - Hole-In-One Challenges added.
March - Merion Golf Club East Course - CTTH
May - Merion Golf Club East Course for US Open.
September - Merion Golf Club 2nd hole placements added.
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2014
January - Experience at Koele - CTTH
March - Pinehurst #2 - CTTH
May - Pinehurst #2 for US Open.
September - Bandon Dunes Resort all par 3, 18 hole course.
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2015
March - Chambers Bay - CTTH
November - Pebble Beach Golf Links (Front 9)
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2016
To Be Announced