The easyiest way to tell a mason here is the sneeky ways they great each other. They can't give the secret hand shake so they mark their posts in various ways. I'm taking a big risk but I'm gonna blow the lid. To the untrained eye what often seem like typos or inocent spelling errors are actually secret little signals.
The most open and common marker is the symbol "™" meaning Theocratic Mason. They place this at the end of special words like "kingdom™" and "almighty GOD". You'll notice people like Clam and scully use it all the time.
unclebruce,
Funny you should mention this here, just after you completed the Initiation Ceremony™.
By the way, you never disclosed your membership with the Carpenters©. But the way you whipped up that pergola© made Clam and me kind of suspicious.