[dkeixm]

What it do? --> Just upload your code to serverlessly.io. You receive a REST endpoint. You can trigger your code via HTTP verbs. GET for immediate response, POST for scheduling the code.

When You should use? --> If you developing one of these; Mobile apps, IOT, REST endpoints for Webapps; You will consider solutions like serverlessly, AWS lambda, Google CF over building own cloud infrastructure with ec2 or Google CE. Also, there are projects that consider separating out Compute/Memory intense tasks, Single-purpose stand-alone tasks from the stack to REST endpoint.

What are use-cases for individual rubyist ? ---> Building web crawlers, Program to send bulk emails or schedule emails, Processing text, Converters(csv, pdf..etc), A cool REST endpoint that other can use.

To answer your question, first one is right i.e. Publishing text files that happen to be code

[dozzie]

So it's just a pastebin. I fail to see how is it spefcifically suited for IoT or mobile applications.

[detaro]

I think dkeixim misunderstood you with the last line. It seems to run code, AND can host arbitrary files.