Singular vs. plural form of the word "forum"

I’ve noticed that some Discourse instances refer to their community as a forum, and some refer to their community as forums. For example:

Welcome to the forum

vs.

Welcome to the forums

Is this just an anomaly of the English language? — are they both correct? Or is it one of those “everybody does it and there is no reasonable hope of correcting this” kind of things?

I personally would use the singular form when referring to a specific community, Like:

the Discourse meta forum

Thoughts?

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