I came across the expression
... some is controversial, and some is my opinions.
Is this correct? I wonder if “... some are my opinions” might be more correct.
Both clauses can be used correctly and are grammatical in the proper context:
In both cases, "some" functions as a pronoun that refers to a part of the content: "Some of the content is controversial, and some of the content is my opinions". Neither sentence is elegant, but that's a style problem and not a grammatical problem.
English isn't always pretty. <:-(