Free to use. A lot of people need tools to search on Facebook. Funny to believe, but if you look in Google search and type “fb post search”, you’ll get a lot of results of people trying to figure out, how to search for an old post on Facebook and find out that it is impossible task, unbelievable!!! yes, check it out yourself and you’ll see I’m right.
It can be downloded for free from the next link:
http://best.bmkol.co.il/free-fbpostsearcher/
Good Luck!!!