When it comes to breaking a $100 bill, there are several socially acceptable places where you can do so. Here are some options:

1. Banks and Credit Unions: Banks and credit unions are reliable places to break a $100 bill. They typically have a sufficient amount of smaller denominations and can easily exchange your $100 bill for smaller bills or coins [1].

2. Grocery Stores: Many grocery stores have cashiers who are able to provide change for larger bills. Just make sure to check with the cashier or customer service desk to ensure they can accommodate your request [1].

3. Big Box Retailers: Large retail stores like Walmart, Target, and Costco often have cashiers who can break a $100 bill for you. These stores usually have a high volume of cash transactions and are more likely to have the necessary change available [1].

4. Post Offices: Post offices often have cash registers and can provide change for larger bills. This can be a convenient option if you need to break a $100 bill while running errands or sending mail [1].

It's important to note that while these places are generally acceptable for breaking a $100 bill, it's always a good idea to check with the specific location beforehand to ensure they can accommodate your request.

Learn more:

1. Where Can I Break A $100 Bill? - Laura Clery
2. 7 Reasons You Should Always Keep A $100 Bill On You
3. $100 Note