[sbierwagen]

  ... talking about “what’s wrong with the London startup 
  scene” to drive traffic to their site. Consider this post 
  two-fingers up to those people.

Two-fingers up?

[thackerhacker]

http://en.wikipedia.org/wiki/V_sign#V_sign_as_an_insult

[petercooper]

Maybe I live a sheltered life, but it's very uncommon nowadays compared to the single finger, no? At least, it seemed far more common back pre-2000.

[dotBen]

In Britain two fingers (with the palm facing the person making the gesture) is basically synonymous to the single finger. Two fingers the other way around means victory.

There is plenty of argument as to the etymology behind that, so I won't paste specific links trying to explain one theory over the other.