If smartphone users get blocked by an app-interstitial like this, our smartphone Googlebot is likely to get blocked as well, which might make it hard for us to understand your site's smartphone-specific content. 

For ways to better optimize your site's smartphone (or mobile version in general) so that Google's web-search can still understand it properly, check out our recommendations at https://developers.google.com/webmasters/smartphone-sites/

http://www.xkcd.com/1174/
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