Most likely this automatically created those file on your server is because your cronjob command is not handling well for this.

Perhaps you can try check your current Easysocial cron command on your server cronjob configuration page then try modify that command and append this >/dev/null


For example :

[gist type="php"]
/usr/bin/wget -O /dev/null "http://yoursite.com/index.php?option=com_easysocial&cron=1"; >/dev/null
[/gist]

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Thank you for understanding.