- When you hover your mouse over a link in the blog (see the little icon to the right of the link?), it gives you more information about the link - maybe even a miniature display of it. i.e., it enhances some links by providing visual previews.
- The further information allows the reader to choose whether they want to follow that particular link to find out more. This would seem to be a better alternative to following the link and only then finding that actually it is not very interesting/useful to you.
Should you decide this is not for you, just click the Options icon in the upper right corner of the Snap Shot and opt-out.
There's a good discussion about Snap Shots on the blog here. It's all about "drilling" links.