With certain mergers I am really baffled as to how these could go through without triggering the anti-merger act. At least in retrospect, it seems as if many of

With certain mergers I am really baffled as to how these could go through without triggering the anti-merger act. At least in retrospect, it seems as if many of those (especially DoubleClick, Admob, Whatsapp, and Instagram) should not have passed the "may be substantially to lessen competition, or to tend to create a monopoly." criterion of the act. It's also really interesting to see that in the case of FB, the merger of Onavo seems to have been conducted just to gain data for determining a strategy for more significant follow-up mergers (resulting in the acquisition of Whatsapp).