All I know is that someone mentioned in a thread that you could get experience by posting articles which then get accepted. I am not sure if it's true, and how much experience you get out of it.
You can get some XP by creating a thread or completing a game task.
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
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How do i get xp? i know i can post comments but that doesnt give enough