Having this as hobby project I usually have time to focus on following only single malware threat at a time - now I have main focus on Locky download sites. If I read some interesting whitepaper, I will probably import some links/hashes to tracker database here and there, but in general I do not verirify or follow on those. This site is considered to be mainly research platform and directly using the data for blacklisting is not recommended. At least you should make sure to filter out with some reasonable whitelist. For example if some malware will be connecting to for example 'http://google.com/70.exe?1' (as Teslacrypt did to query connection) or to '//plus.google.com/u/0/115747778649102578052/about' or 'https://twitter.com/linketelin' (as PlugX samples d9af894d51ba61075c7cd329b0be52df, 02a175b81144b8fa22414e9cf281f71c did) then such links can be found in the listings of tracker although I am not saying the sites as such should be blocked.