No, it’s not what you’re thinking — Google Ventures didn’t just invest in a Groupon clone. But the search giant’s VC arm is taking a stake in a local deals startup called Signpost, which looks to help you find the best deals in your neighborhood (more on that in a moment). The size of the Google Ventures investment isn’t being disclosed, but it’s a follow-on to a $1 million seed round Signpost raised earlier this year