A nice web-site, by the way. Especially like this graph with bubbles:)
But how can you know all this connections and "common investors"?
We have a log of investments captured from blockchain.
If a person invested in ICO A and ICO B we treat it as a connection between A and B. The more mutual investors the stronger a connection.
I see. I suppose that feature can be very beneficial for ico projects helping them to adjust their marketing strategy, ads and etc. And for people (potential investors) as well:)