Diigo does have a couple items I would like to see worked out. First of all they didn’t get the memo that we have reached the mobile tipping point. I would love to see an iPhone version of this so I can use it on the go. Where is the API? How can you have a service in today’s market place without an API. Finally, trackbacks. Let me carry the conversation back if I can. So many social sites don’t implement this and it seems vital to enabling a conversation.