Forum Trust, how does it work? What are the adcantages of increasing it and how do I do it?

[Ceranity-terenas]

There are full details about the forum and trust levels in one of the pinned posts at the top of General Discussion:

The Ultimate Forum Guide (Codes, Trust Levels, FAQ)

To all heroes of Azeroth, Sanctuary, Aiur, the Nexus and future Earth! Allow me to introduce myself: I’m Pachimari, one of many Customer Service MVPs in Europe. If you’re reading this, it means that the forums for your favorite game have been updated to the much better version that you’re browsing right now. Not only have many things become easier to manage; there are plenty new functions as well, like the Blizz tracker, notifications, … As you may already know, these…

Iirc, TL2 allows you to post links to trusted sites while TL3 allows you to post any links, which allows for posting pictures and GIFs.