Hi,
We changed the category of the plugin "hikasocial" in order to avoid issues with some cache systems.
The content version is not deleted to not break the users websites ; but you can "migrate" to the plugin in the system category and delete the previous one.
HikaShop package contains a lof of plugins which are installed in same time than HikaShop (or during updates).
We don't recommend to uninstall unused plugins but we recommend to unpublish them.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.