Many of my readers will have heard of the Cloudflare breach but may not be aware of how many sites use this DNS.
To check whether you are using a site that is on the list see List of Sites possibly affected by Cloudflare's #Cloudbleed HTTPS Traffic Leak
When I checked the list, I spotted the sites 23andMe, Fitbit, Feedly, Uber, and others that I know many genealogists use.
While being on the list does NOT necessarily mean that the site has been hacked, in order to be pro-active I changed my passwords on these sites.
Please note the caveat by the author of this list: "This list contains all domains that use Cloudflare DNS, not
just the Cloudflare proxy (the affected service that leaked data). It's
a broad sweeping list that includes everything. Just because a domain
is on the list does not mean the site is compromised, and sites may be
compromised that do not appear on this list."
Credits: Thanks to J.D. Thomas of Accessible Archives for posting the link to the list on Facebook