Vanity Fair: Twitter co-founder Evan Williams, who stayed on the board after Dick Costolo took over as CEO, tried persuading Twitter’s board to buy his news company, online publishing platform Medium. It was a move that stood to integrate both Williams and Medium into Twitter’s existing platform, allowing Twitter to move beyond its aggrieved 140-character limit. But it came with a steep price tag: $500 million. Ultimately, the board had to pass.