The auction house estimates the sign's value at upward of $40,000. Eleven bids had already been placed as of Monday evening, driving the current price up to $21,664. The bird is on sale as part of ...

Bids surpassed $21,000 as of Monday night. The seller, RR House, estimates the sign's value at upwards of $40,000. Twitter's blue bird logo sign — which formerly hung outside the company's ...