The INTERNET Database of Periodic Tables
There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.
Social Media Periodic Table
A Periodic Table of Social Media Elements. The original post can be found here, the full size flickr image here, but there is a blog that explains the meanings of all the two letter designations here:
© Mark R. Leach 1999-
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counter started in 2011