Whom can I talk to?
who can i talk to
Not ending a sentence with a preposition was a valid rule/observation about Latin (and is about Spanish). There have been misguided attempts to "impose" the same rule on English. Serious (and knowledgeable) writers about English usage have been rejecting the relevance of the rule to English pretty much since the "rule" was first proposed (cf. Fowler, Churchill at al.)
"Who should I talk to?
If by "correct" you mean that it follows the rules and internal logic of the language, then "who" is incorrect (it is the object of the preposition "to" [no matter where placed] and the objective case of the interrogative pronoun is "whom"). If, on the other hand, you are misusing the term to mean "popular", widely [perhaps, almost universally] used" then you may wish to call it "correct".
My apologies to the author of this thread. It seems that he did, indeed, post a questions that prompted responses and that he did it in a very clever manner.
You can talk to anyone who wishes to reply, but to bring that about, I would suggest that you post a question more likely to invoke a response.