switching.social
#Inventaire is a free open site which lets you easily catalogue, borrow and lend physical books:
You can follow them on here:
It's useful for cataloguing collections, sharing books and keeping track of private libraries.
Inventaire's title database uses Wikidata to help find a book's details automatically.
Jonkman Microblog is a social network, courtesy of SOBAC Microcomputer Services. It runs on GNU social, version 1.2.0-beta5, available under the GNU Affero General Public License.
All Jonkman Microblog content and data are available under the Creative Commons Attribution 3.0 license.