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Trust Level 1 – Basic
Get to trust level 1 by…
Entering at least 5 topics
Reading at least 30 posts
Spend a total of 10 minutes reading posts
Trust Level 2 – Member
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
Trust Level 3 – Regular
To get to trust level 3, in the last 100 days…
Must have visited at least 50% of days
Must have replied to at least 10 different non-PM topics
Of topics created in the last 100 days, must have viewed 25% (capped at 500)
Of posts created in the last 100 days, must have read 25% (capped at 20k)
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 or silenced in the last 6 months
These likes must be across a minimum number of different users (1/5 the number), across a minimum number of different days (1/4 the number). Likes cannot be from PMs.
All of the above criteria must be true to achieve trust level 3. Furthermore, unlike other trust levels, you can lose trust level 3 status. If you dip below these requirements in the last 100 days, you will be demoted back to Member. However, in order to avoid constant promotion/demotion situations, there is a 2-week grace period immediately after gaining Trust Level 3 during which you will not be demoted.
all of this are obtained from : Understanding Discourse Trust Levels