this is very interesting! Memolane, a timeline for all your social media traces. One of the things that popped up when I saw this was: hey, this is great way to find back old tweets (as Twitter search being so aweful...).
And, wouldn't this also be great for a business environment? It would tell you when you sent emails, checked-in/-out documents, searched for information on the intranet, etc.?
What I understand is that Memolane is not moving into this space. Business opportunity!