Complete the sentence: Social media users in the United States are more likely to be influenced by posts that ___ their beliefs rather than ___ them.

Social media users in the United States are more likely to be influenced by posts that confirm their beliefs rather than challenge them.

The completed sentence is:
Social media users in the United States are more likely to be influenced by posts that $\boxed{\text{confirm}}$ their beliefs rather than $\boxed{\text{challenge}}$ them.