Interactive post best practice: Involve friends Monday, December 9, 2013 | 1:54 PM This is the first in a 2-part series that chronicles best practices for interactive posts. Come back next Monday to read the 2nd installment. As part of our launch of Google+ Sign-In we introduced interactive posts : Google+ posts with custom calls-to-action button like buy, listen to, review, or just view. We’ve since found that interactive posts have a click-through rate that’s 3x higher than a standard share! In this two-part blog series we’ll cover a few best practices for incorporating interactive posts into your app. In today’s installment, we’ll review how +Fancy has integrated interactive posts into their app resulting in highly targeted, action-oriented shares. Let’s take a look at how they’ve done this: When I create a group gift on Fancy, there’s a prompt to ask friends for contributions. Prominent placement of the button on the page encourages users not to miss it.…