From Facebook then on to LinkedIn. And from one world view to another.
Obviously the inexorable rise of Facebook members - over 800m is well documented. But through LinkedIn's eyes it is not about 'how many but who'.
Again it is amazing at how many successful businesses are driven by an insight that ultimately defines who they are and what they do.
Sure Facebook is about the who - the timeline of your life etc - but one still gets the real sense they still get their real buzz (as they did in the movie The Social Network - on their march to global ubiquity.
LinkedIn's universe is of course not the whole universe as it is for Facebook but the professional universe. And right now they are at 130 million. A little factoid that was new to me was the while the US represents their biggest community, the UK has been knocked down into third by India a really interesting piece of evidence for the rise of the global middle class in that country.
LinkedIn provide a brilliant showcase for the case for data driven web. They have some fab tools, products and services that enable professionals - individuals or companies - to find 'the one(s)' they are after. And, conversely, when people are searching companies they have equally smart tools allowing businesses to present tailored content to these people that is served up based on the data connected to the person concerned.
The final observation for now is how fast LinkedIn has been to evolve their business. Two examples of this. Firstly, mobile. LinkedIn realised that professionals are mobile and they ploughed into this space big time and fast. Secondly, content. - LinkedIn has overnight become a huge and influential content aggregator. However, their original mission: to connect the world's professionals to make them more productive and successful gives them permission to play. And LinkedIn are playing big time.