Browsershots respects the robots.txt standard. If you want, you can explicitly allow Browsershots by adding a section like this to the robots.txt file on your server:
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Value %d is too small.
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This saves your time to get screenshots and help us pay off some development and hosting cost.
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The server did not send a content type header.
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Website Tags
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Thank you. Problem has been submitted.
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Get screenshots of any web address, as often as you want.