As Of Today....Is The Sentence (Tweet In This Case) Qualifier....
What's A Qualifier?
"Qualifiers and intensifiers are words or phrases that are added to another word to modify its meaning, either by limiting it (He was somewhat busy) or by enhancing it (The dog was very cute). Qualifiers can play an important role in your writing, giving your reader clues about how confident you feel about the information youre presenting. In fact, hedging (as it is sometimes called) is an important feature of academic writing, because academic writers need to clearly indicate whether they think claims are certain, likely, unlikely, or just false. But excessive use of qualifiers can make you sound unsure of your facts; it can also make your writing too informal."
https://writingcenter.unc.edu/tips-and-tools/qualifiers/
See "As Of Today" Sentence Qualifier Used In A (Useless) Tweet:
Why Is This Tweet Useless? Because No One Was Expecting Oprah Winfrey, "
AS OF TODAY" to say one way or the other if she is running for POTUS in 2020.
In fact, if Oprah decides to do so, it would be
MONTHS before she would announce --- literally
MONTHS and not "
AS OF TODAY".
Thus, Oprah has every right to explore her options
AS OF TODAY, TOMORROW, NEXT WEEK, NEXT MONTH, FOR MONTHS to make a decision if she would jump in the race to run for President of the United States.
The only thing that should stop the rumor-mill about if she is running or not, is a statement from Oprah herself, as she knows fully well how to speak for Oprah.
#FYI