The Splinterlands Guide was the first featuring a Layer 2 token from Hive blockchain. Splinterlands itself has around 10 tokens it uses, but DEC was the most relevant at the time.
The guides are mostly around major cryptocurrencies, lesser ones which get lots of buzz (SafeMoon and Shiba Inu), and HIVE.
RE: Daily Crypto Markets Live Blog: The Start Of Leomarkettalk Commenting Contest (09/1/21)