(1) Я ему расскажу о тебе.
(2) Я ему расскажу про тебя.
I know that each of these sentences roughly translates as I will tell him about you, but what is the difference? Do the connotations or undertones fully coincide?
I tried doing research in Google, but did not find anything about the difference between the specific phrases расскажу о тебе and расскажу про тебя and got confused by conflicting opinions of native speakers about the difference between o and про in general. Some people say that there is no difference in the meaning between these prepositions, whilst others say there is some subtle difference. Here is an example of a discussion about these prepositions.
A language exchange partner from Russia was unable to give me an immediate clear answer. He only shared his observation that Sentence (2) can be used to express an intention to complain, whilst Sentence (1) rather cannot.
I am confused and humbly hope to get help.
UPDATE: There is a similar question and an interesting answer to it, and I am thankful for pointing them out. That question is about the difference between o and про in general, whilst my question is specifically about the difference between расскажу о тебе and расскажу про тебя. The aforementioned answer, however, mentions those particular expressions. In that answer, Anixx states his opinion that расскажу про тебя implies an intent to introduce you or tell a certain thing about you or something new about you. This seems to answer my question, but a comment by a native speaker below that answer says, " ... I do not sense any difference between o and про at all, so I, personally, am not convinced. Of course, I'm no philologist, but I am native speaker, and I've grown to trust my gut feeling when it comes to language. My gut tells me there's no semantical difference between the two prepositions." Nevertheless, Anixx' answer got a score of +12. I'm not sure whether my question should be deemed a duplicate, and I do not insist on keeping it open. Anixx' answer provides an answer to my question. Yet, in view of conflicting opinions of native speakers about those prepositions, I would be thankful for a reference to a dictionary or any official or half-official source clarifying the difference between расскажу о тебе and расскажу про тебя or at least between o and про in general.