Sally wanted to sell an antique doll that she had inherited. She posted a photograph of the doll on her Facebook page with a note stating:

Last month, one just like this sold on eBay for $650! I'll sell it to any of you for $450. First person I hear from gets it. Otherwise, after five days, I'll sell it on eBay. Call me - no Facebook allowed at my job.

That same day, Barbara, one of Sally's Facebook friends, saw Sally's post. She believed that the doll might be worth more than $450. She soon learned from a local antique dealer that it was worth $1,500. She used her tablet computer to go on Sally's Facebook page. There, she saw a note posted by Judy, another Facebook friend of Sally, stating: "The doll is worth way more than you think. Don't sell it." Barbara then left a note stating, "I'll take the doll for $450. Barbara." Later, she called Sally and said, "This is Barbara, and I'll buy the doll for $450." Sally replied, "Sorry, you're too late." Barbara looked again at Facebook and saw a new note from Sally stating: "Thanks for the information, Judy. The doll is going straight to eBay."

Did Barbara enter an enforceable contract with Sally? Discuss.

If Barbara entered an enforceable contract with Sally, what remedies, if any, does she have?