Find Microsoft Excel related forums, hashtags and web sites

This is a research project. The task is to find forums, web site authors, twitter hashtags, social media places etc. related to Microsoft Excel. My goal is to draw the attention of people to my newly released Microsoft Excel Add-In and to generate traffic for its web site www.formula-xray.com. I will try to get in contact with site owners, participating in forums, etc. The list shall contain a brief description of the web place, its URL and its Alexa rank ([login to view URL]) or other relevance KPIs. The search should be limited to resources in English. If the freelancer is able to understand German, then I would extend the task to German places as well. Please mention if your offer covers German or not. No deep Excel skills are required, only a basic understanding of what Excel does and what an Excel Add-In is. My product can be downloaded for free from www.formula-xray.com. The expected number of web places found should be +/- 20. The list should be ordered by relevance. Details about the relevance criteria can be discussed later. I will stay in constant contact with the freelancer in order to make it a good experience for him and me.