It's *possible* that there is a home office employee who is responsible for social media... or has a "google alert" for when ONESCO is mentioned? It could be a compliance function. (Maybe a new required position requiring a new securities license so FINRA can help "boost the economy"?)
A simple IP check would help authenticate this user.
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Sam has shared before that he knows that there are life insurance and B/Ds that check out this forum on a regular basis.
If you Google "ONESCO", this thread shows up as the #6 search result...what you said wouldn't be surprising.