This is likely the biggest strategic mistake they did. Product specific sub-websites such as maps.google.com or office.microsoft.com are a must to expose divers

This is likely the biggest strategic mistake they did. Product specific sub-websites such as maps.google.com or office.microsoft.com are a must to expose diverse functionality properly. They tried to shove everything into same status-post website. I can imagine dating.facebook.com, market.facebook.com, etc where these subsites are fully customized according to their domain but they take advantage of all the data they have.