is this a compound sentence

Secondly, regular use of social media can result in low self-esteem, comparison anxiety, and feelings of not being good enough.

Yes, the given sentence is a compound sentence. It consists of two independent clauses joined together with the coordinating conjunction "and." The two independent clauses are:

"Regular use of social media can result in low self-esteem, comparison anxiety, and feelings of not being good enough."

"Secondly," (independent marker) initiates the second independent clause.

Yes, the sentence "Secondly, regular use of social media can result in low self-esteem, comparison anxiety, and feelings of not being good enough" is a compound sentence. A compound sentence is a sentence that consists of two or more independent clauses (complete thoughts) joined together by coordinating conjunctions, such as "and," "but," or "or." In this case, the independent clause "regular use of social media can result in low self-esteem, comparison anxiety, and feelings of not being good enough" is connected to the introductory word "Secondly" using a comma. Therefore, it forms a compound sentence.