When social media replaces most face to face contact, an accountant hunts down apocalyptic fundamentalists who almost killed him with one of their bombs.

Richiev, you're right that the accountant character should be individualised more with some character trait. (Normally that is a mistake I pick with other people's loglines ... Ironic!)

The "when" clause is meant to be read as a setting statement, rather than a statement about the inciting incident. Although if this creates ambiguity, it's good that I'm told about it. The inciting incident is simply the bomb blast, as the protagonist was never targeted in particular.

The idea is that this is set roughly +10 years from now. (Or is the consensus view here that we already ARE in a world where social media replaces most face to face contact?)

I agree with dpg, this story needs a good inciting incident. How about this:

"After his wife is killed by a fundamentalist's bomb"

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"After his wife is killed by a fundamentalist's bomb, a meek accountant uses his internet skills to hunt and destroy the terrorist cell before the city is hit again."
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Hope that helped, good luck with this!