Super Bowl marketers holding back on pre-releasing spots

Commercials during this year's game were sold for $5.6 million per 30 second spot

The days are counting down to this coming weekend's big NFL game and so far marketers are keeping a tighter hold on their Super Bowl commercials, according to MediaPost.

Just 24 brands have released commercials and/or ad teasers -- on  platforms including YouTube and Facebook, according to data from iSpot.tv.

That comes to about $13.5 million in media spending.

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Looking at the year ago period,  40 brands pre-released their ads worth $18.7 million.

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Porsche and Doritos have had a large amount of online views getting 4 million and 1.8 million views, respectively.

This iSpot research comes from online views of Facebook and YouTube.

Commercials during this year's game were sold for $5.6 million per 30 second spot.

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The game will be broadcast on FOX on February 2.