I’ve played with Rollyo in the past and didn’t find it of much use as I don’t do many subject specific searches. However, on further investigation, I could see a library setting up some specific topic-based searches for use on the reference desk. For example, Lincoln City Libraries setting up a search that runs against all sorts of Lincoln-related resources.
I did end up creating a pseudo ego search for myself. Use this one to search against all my different sites and profiles that I’ve got online. For example, if you want to see what I’ve posted online involving the commission search the box below for NLC, choose "The Travelin’ Librarian" as your search engine, click Search and see what you get.