It is a good idea but another question might arise again, does Facebook accept bitcoin as a payment option when you want to create ads? Because the last time when I tried creating a Facebook page for a friend when it was clicking the payment option, I didn't see bitcoin has a payment option. I saw only USD, EURO and NAIRA from my country's end. If you want to accept BTC in your business then you don't have to look the volatility of BTC because that the nature of it. So as business person it is you will know how to manage the situation at hand.
If you want to add BTC in your social media pages, you can manually state in there even though it is not in app or the site for people or viewers to know that you also accept BTC.
Facebook is an American company and there are only 2 countries (El Salvador and the Central African Republic) so far that lawfully accept bitcoin as a legal tender so we may not see a bitcoin payment setting on these big social media giants. OP can easily mention it in its posts though.
Some business establishments convert bitcoin payments into fiat right away to avoid its volatility. But personally, if I am the one owning the business and it is still small, I will HODL bitcoin payments and only convert it at least in 2025 or after the halving year.