Notice that in the sentence
I love Internet forums, like Stack Exchange
"like" is a preposition and "Stack Exchange" is its object.
Substitute "like" with "for example"
I love Internet forums, for example Stack Exchange
What does "Stack Exchange" function as in the latter sentence? An appositive? The object in an elliptical clause? Something else?
Or, to move the focus away from "for example" to the noun,
I love Internet forums, particularly Stack Exchange
"Particularly" is an adverb. But what is "Stack Exchange"?
Thanks in advance.