CrowdTangle’s founders started their tool in 2011. When it was founded, the app, which won funding from the Knight Foundation, tried to organize activism on Facebook by merging pages, events, and groups into one central place. In some cases, like the Occupy Wall Street movement, it worked great. In most cases, it didn’t. So that version of CrowdTangle does not exist any longer.
What did work well on the first version was a widget that tracked how posts on causes' various pages were performing. The algorithms Facebook uses to surface posts in news feeds are mysterious and "constantly evolving". What CrowdTangle does is provide a dashboard that keeps track of how posts on your own pages, your competitors’ pages, or any other group of pages that you want to create, are performing relative to average engagement for that page.
CrowdTangle also tracks keywords, so that you can see the best performing stories and it tracks URLs, so you can check out where your links (or a competitor’s links) are performing best...and it does much more.