Hi Maurice. Thanks for the comment. Sorry for the delay in approving responding. I am not aware of any third party tool to isolate Fans (likes) for a business page to a specific time period. I did some searches on Google, but to no avail. I did come across a free benchmarking tool at barometer.agorapulse.com that you might find interesting to compare your Facebook business page against their benchmark. I will reply to this comment and let you/others know if I find a tool that addresses your specific need as there appears to be market demand based on the discussion on the Facebook help/support section.

Hi Steven, thanks for the comment and question. For Google+, 5000 is a limit for the number of people you can have in your Google+ circles whereas there is no limit that I am aware of in terms of the number of people who can have you in their circles. Some celebrities are in 100s of thousands of circles but generally have less than 5000 in their circles. The 5000 limit includes when you have been blocked by another users, so for most, the limit will be below 5000. My suggestion is to clean up your circles. To date, there is not a lot of tools to manage Google+ circles, but if you Google circle management tools, you may find a Chrome plugin to assist with which users to uncircle. I uncricle inactive users first. Anyone who has not posted in 1 year for example. Hope that helps.