After yet another round of revelations about Facebook's use of customer data, Basecamp has decided to become 100% Facebook-free. We've actually been off Facebook proper for a while, but on Wednesday we decided to remove the company from Instagram and WhatsApp as well. This is a conversation with Basecamp's CTO, David Heinemeier Hansson, about making that decision and why he thinks you should follow in Basecamp's footsteps.