I don't know either RebelMouse nor Flipboard, so that doesn't help. I'm also not exactly sure what you mean by "cross-platform engagement analytics".

Is it possible to describe what problem it solves without the Ginger Factor? Perhaps I'm just not of the "social media" generation, but I'm still not really sure what it does

Does your intended audience?

The target demographic is anyone active on multiple online services and the usefulness of an app that unifies these services would be more efficient because you could go to one place to consume information rather than many. Considering this is for social media power users it might be lost in translation if you are not actively engaged in social media or the common practices with the goal of making themselves more accessible to people interested in them. Much like About.me where a homepage is created by you and you say who you are and what you're interested in, my profile allows you show who you are through your actions, not just a short paragraph about what you like.

An example of tracking engagement of your posts is like in Facebook when you have a notification that you have 3 "likes" on your picture or on Twitter your tweet got retweeted 5 times or favorited by people. These instances can be tracked across all authenticated services a person creates content on and right now my app connects facebook, twitter, foursquare, instagram, tumblr, and linkedin so each social network has its specific type of engagement (a few examples above).

So, Showw.me gives me a page that aggregates all my posts from various social media networks? ie. all my Facebook status updates, my Tweets, my new Instagram photos. And through that I'm able to get a bird's eye view of the interaction/traction/engagement I'm seeing across platforms.

Is that right?

Yes that's correct.

Showw.me mirrors the site structure of traditional social networks such that individuals get a profile page along with a dashboard showing an activity feed of people within their network. The distinguishing factor is that showw.me pulls in content created on other networks that are connected rather than creating original and then cross-posting to other networks.

One main goal of the network is to allow content authors (anyone that creates a post) maximum visibility while retaining the benefits of using niche social networking sites. In other words, i can use whatever service i want to post my runs, photos or blog posts but i know it will always show up in my showw.me profile.