Community - You can find statistics about your community on ModTools Dashboard. The number of members your community has is on the website homepage and also on Members>Approved.
Councils - Freegle has a toolkit on the website which provides lots of information for local councils - https://www.ilovefreegle.org/councils/
Flytipping - In 2019 Freegle saved £167,910 in preventing fly-tipping. A couple of statisticians at DEFRA did some pro bono work for us in July 2020. They estimated the cost of the fly-tipping we have prevented, the report is here: https://drive.google.com/drive/folders/1drC7kpPQy-JjVKJtb15d4Vog2o-2C1VB?usp=sharing 3
Weight Statistics - There are several stages to our estimates:
- We started with the 2009 Furniture Reuse Network estimates, which we then expanded to include some estimates for non-furniture items.
- We use these to estimate the weight of items diverted from the waste stream, and use a weighted average (no pun intended) value to give an estimate for other items.
- We then use the WRAP Benefits of reuse tool to convert that weight to a CO2 and monetary estimate. The tools is mentioned in the report here  and is available here .
This is an area which is sorely lacking in standardised data, but this is about the best we've found.