It became pretty clear it wasn’t going to happen. The deal would have to be done with Facebook stock. And then you have to figure out how much the stock is worth.
Peter Thiel • Facebook board member and a co-founder of Paypal. Thiel confirmed a proposed merger of Facebook and Twitter, which only fell apart because nobody knew how much Facebook’s stock was really worth. Structurally, it makes sense: status updates are essentially tweets. • source