If what you need is a CMS this might be a good platform. I've looked into it a few times because I like Erlang. However their data model is pretty opinionated, everything needs to fit into their concept of "resources" and "categories" and "edges" which relate them.

In my project ideas I always quicky felt like I was having to shoehorn my data model (a much more standard relational model where entities have specific attributes of specific data types) into their "resource and category" model and it just seemed like that would involve a ton of compromises, overhead, and extra work.

If you want to build something that is essentially organized text articles or other media, it could be a good choice.