A small hammer, and a question about your toolbox
FindMe is a small command-line username checker under the MIT licence. It looks for profiles linked to a handle across a few hundred sites. The Consensus snapshot used for this course put that figure a bit above four hundred, well short of Maigret, in the same neighbourhood as several tools you have already used. Maintenance has been quieter than User Scanner or Maigret. Both the count and the pace can change. The README you clone is the source for both claims if you ever repeat them outside class.
It is the weakest pick of the twelve on purpose. You do not need another way to ask the same question Sherlock asks. You need a point in the course where the correct professional move is to stop installing things. FindMe is that point. If it adds a confirmed hit the others missed, good, keep it as a cross-check and write down why. If it adds nothing but false positives and ten minutes, uninstall it. The uninstall is the advanced technique. The install is the easy part, which is why people accumulate seven username tools and still cannot say which hit they opened.
By now the track has handed you Sherlock, Maigret, WhatsMyName, GoSearch, Aliens Eye, and possibly User Scanner. They rhyme. FindMe rhymes too. The skill left to practise is sufficiency: the smallest set of tools that answers the question you wrote down, and a rubbish bin for the rest. A dock full of scanners feels like readiness. It is often procrastination with extra binaries.
The most advanced move in this lesson is removing a tool you just proved you do not need.