Are computer games and the internet to blame for the ever decreasing standard of literacy among children?

A recent poll shows that UK children dropped from 3rd in the world to 19th in terms of literacy? Why is this?

Blaming technology for decreasing literature is a cop-out. Last I checked, using the internet involves a lot of reading. I would venture a guess that the average child with regular internet access reads more content than a child twenty years ago each day. They just read fewer books printed on paper.
Computer games probably contribute to obesity, but not likely to illiteracy, since they take the place of outdoor play.

The fault lies with schools, parents, societal values and social messages.
Educational standards have declined. This is no ones fault but the schools. (Not the teachers, but the schools as a whole.)
Parents, especially low income parents, have to work more, and spend less time reading to their young children. And the parents are often not terribly literate to start with. A recent study in the US found that less than 50% of Americans read for recreation. I imagine the figures in the UK are similar.
Society does not value intellectual pursuits. Society values money and power. While literacy and money and power are certainly connected, that is not always the message that comes across.
And there is the social messages that children get. When one knows that they will end up working in the factory just like their dad, there is far less incentive to pursue their studies.