Memo transaction

Post memo Kraken and bitstamp started in 2011 too, only 2 years from the first block. In 2010 the main source was mining and faucets (eg I got 25 from Gavin's facuet).
Reply to memo 2bcd020c3a5a0097805ebfb99133d2cd3ab9f1d7a292e12a59aae76e05c55f93