Preli: Flash crashes and HFT, 2nd coming presentation and discussion

In the series of our rather regular monthly meetings:
A presentation recently given to The Helsinki Shareholders Association, in Finnish – we could go through it in English, the slides will remain written in Finnish, though. 
The presentation is around 60 minutes in length, there would be 1 h for discussion. The presentation may be interrupted at any time and any opinions exchanged. The presentation is of rather general nature, but discussions could take it a bit deeper...