If the Blok goes on winning more votes, the united front against it may break.
By closing ranks against the Blok, the other parties have given it a monopoly on the protest vote.
The company's CEO, Mr. Blok, said the move from texting to such applications was expanding rapidly from its younger subscribers to adults.
But by dismissing the Blok as little more than a bunch of Nazis the Belgian political establishment has talked itself into a corner.
The Blok has some unpleasant ideas, and attracts some unpleasant people.
The Blok's roots do indeed lie in the resentments of families of former Nazi collaborators who faced penalties and discrimination long after the war of 1939-45.
The other main parties promised at once to form a coalition in Antwerp, as they did in 1994, to exclude the Blok from the city government.
The Vlaams Blok, a militant Flemish party that campaigns against immigration and for the break-up of the Belgian state, has been gaining ground steadily for a decade.
In Flanders as a whole, opinion polls put the Blok above 15%, and in Antwerp, the country's second city, at the most recent local elections it won one-third.
Whenever politicians seek to move the conversation from the "subterranean" to the surface, they are either banned (Begium's Vlaams Blok), forced into exile (Aayan Hirsi Ali) or killed (Pym Fortuyn).
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Indeed, the Blok might have done even better, save that a new federal government, led by Guy Verhofstadt, a Flemish liberal, has started bringing tax rates down and shaking the bureaucracy up.
But ostracism means that building governing coalitions is becoming ever harder, while confirming the Blok in its ways, and in its criticism of the political establishment as a cosy, self-serving and corrupt monopoly.
If this carries on, and if Mr Verhofstadt does not lose his touch, then support for the Blok may be held to a level that is merely embarrassing and uncomfortable, not outright catastrophic.
The one devoted to the Russian revolution, short enough to whet the appetite for more, is amongst the strongest, both in its choice of extracts, and in the effectiveness and immediacy of its poetry by the likes of Alexander Blok and Anna Akhmatova.
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