The awarded experience for posting a story is as follows:
(I will add experience to your sheet, so please do not do it for me. This prevents double XP awarding.)
Heroic Tier Characters:
-200xp for starting a new story.
-150xp per post added on to a running story.
-200xp for an exceptionally engaging, imaginative, or revealing/insightful post.
Paragon Tier Characters:
-1,200xp for starting a new story.
-900xp per post added on to a running story.
-1,200xp for an exceptionally engaging, imaginative, or revealing/insightful post.
Epic Tier Characters:
-7,000xp for starting a new story.
-5,250xp per post added on to a running story.
-7,000xp for an exceptionally engaging, imaginative, or revealing/insightful post.
Characters Beyond Epic Tier:
-47,000xp for starting a new story.
-35,250xp per post added on to a running story.
-47,000xp for an exceptionally engaging, imaginative, or revealing/insightful post.
All other posts subject to DM consideration and approval.
Thanks to Arius at Bolermos for the breakdown!