Every time he drinks a cup of coffee, Dan Meyer makes a note on his phone. He does the same every time he opens a beer, turns on his TV or travels away from home. At the end of each month, he spends about three hours transferring these meticulously gathered notes into an excel spreadsheet. Meyer isn’t obsessive compulsive, he just likes data. Like an increasing number of data geeks, he uses his personal life as a project — compiling small events into a sometimes elaborate, graphic annual report each January.