https://us.forums.blizzard.com/en/wow/t/new-forum-guide-syntax-and-features/19903
Trust Levels
Trust levels are a participation system on the forums. The more you post, like, reply, read, and visit the forums, the more you work your way to a higher trust level. Increased Trust levels grant additional privileges. Everyone who is new starts off at Trust Level 0 but will quickly climb by reading and visiting the forums within their first few days.
TRUST LEVEL 0
Trust level 0 users cannot:
- Flag posts
- Post more than 3 topics
- Post more than 10 replies
TRUST LEVEL 1
Get to trust level 1 by…
- Entering at least 5 topics
- Reading at least 30 posts
- Spend a total of 10 minutes reading posts
Users at trust level 1 can…
- Post unlimited topics and replies
- Edit wiki posts (more on Wiki Posts Below)
- Flag posts
- Create links and video embeds to trusted websites like Blizzard websites, YouTube, or Twitch
TRUST LEVEL 2
Get to trust level 2 by…
- Visiting at least 15 days, not sequentially
- Casting at least 1 like
- Receiving at least 1 like
- Replying to at least 3 different topics
- Entering at least 20 topics
- Reading at least 100 posts
- Spend a total of 60 minutes reading posts
Users at trust level 2 can…
- Have an increased “like” count.
TRUST LEVEL 3
Get to trust level 3 by…
- Must have visited at least 50% of last 100 days
- Must have replied to at least 10 different topics
- Of topics created in the last 100 days, must have viewed 500 topics
- Of posts created in the last 100 days, must have read 20,000 posts (both starting posts and replies)
- Must have received 20 likes, and given 30 likes.
- Must not have received more than 5 spam or offensive flags (with unique posts and unique users for each, confirmed by a moderator)
- Must not have been suspended (including forum suspensions or in-game account actions of any Blizzard game)
Trust Level 3 users can
- Create Wiki Posts (more on that below)
- Post animated gifs, images, compatible video embeds, and links to any website
Edit to add: Ignore the wiki stuff