How do Discourse's Trust Levels work on the Straight Dope?

I think I read somewhere you start at TL1, quickly go to TL2 and then are capped.

If you can catch a new poster in the first few minutes of their SDMB experience, the name will be a little greyed out. I think that indicates TL1.

We don’t have likes enabled which are apparently required for TL3.

ETA:

~Max