parsely.comは安全ですか？

No direct evidence this site does anything "wrong." However from their own description they are involved in tracking which could risk privacy and even aid in identity theft depending on what information they store and who they let access it. The ethical issue is that they gather this information without the users knowledge or permission. From their own About page as of 07/21/2011: "Parse.ly connects you with content you'll love through personalization. Our technology understands a user's unique interests to personalize their experience on content sites across the web. We also provide site owners with in-depth, interest-level analytics about the intersection of their content and audience for editorial and ad sales teams. Millions of readers already use our technology to explore and engage with content, and publishers are seeing their click throughs increase dramatically." "