If I remove all the ReadOnlyDirectories and ReadWriteDirectories from the systemd service file, I don't get this error any more and the socket file is created correctly.

I can't reproduce the issue, do you run with selinux to enforcing, or a specific policy (or some specific change) ?

What does getenforce return, and the output of "semanage export" ?

Yes, I run with SELinux enabled.

# getenforce 
Enforcing

# rpm -q selinux-policy
selinux-policy-3.13.1-191.16.fc24.noarch

# semanage export
boolean -D
login -D
interface -D
user -D
port -D
node -D
fcontext -D
module -D
boolean -m -1 antivirus_can_scan_system
boolean -m -1 httpd_can_network_connect
fcontext -a -f a -t httpd_exec_t '/usr/sbin/fcgiwrap'
fcontext -a -f a -t httpd_sys_rw_content_t '/var/www/ttrss/cache/export(/.*)?'
fcontext -a -f a -t httpd_sys_rw_content_t '/var/www/ttrss/cache/images(/.*)?'
fcontext -a -f a -t httpd_sys_rw_content_t '/var/www/ttrss/cache/js(/.*)?'
fcontext -a -f a -t httpd_sys_rw_content_t '/var/www/ttrss/cache/upload(/.*)?'
fcontext -a -f a -t httpd_sys_rw_content_t '/var/www/ttrss/feed-icons(/.*)?'
fcontext -a -f a -t httpd_sys_rw_content_t '/var/www/ttrss/lock(/.*)?'
fcontext -a -f a -t httpd_exec_t '/var/www/ttrss/update.php'
fcontext -a -f a -t httpd_exec_t '/var/www/ttrss/update_daemon2.php'

Can you also paste the output of "mount" ? 

And does placing selinux in permissive fix the issue ?

It seems like setting selinux in permissive mode fix the issue and the socket is created.

# mount 
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=2012464k,nr_inodes=503116,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,seclabel,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime,seclabel)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/mapper/fedora_argon-root on / type xfs (rw,noatime,seclabel,attr2,discard,inode64,noquota)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=26,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=14424)
mqueue on /dev/mqueue type mqueue (rw,relatime,seclabel)
tmpfs on /tmp type tmpfs (rw,seclabel)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel)
debugfs on /sys/kernel/debug type debugfs (rw,relatime,seclabel)
nfsd on /proc/fs/nfsd type nfsd (rw,relatime)
/dev/sda1 on /boot type ext4 (rw,noatime,seclabel,discard,data=ordered)
/dev/mapper/fedora_argon-bittorrent on /var/lib/transmission type xfs (rw,noatime,seclabel,attr2,discard,inode64,noquota)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,seclabel,size=404712k,mode=700)

I've seen this AVC, so the problem is probably related to the bug #1357395

SELinux is preventing (tor) from mounton access on the directory /run/tor.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that (tor) should be allowed mounton access on the tor directory by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c '(tor)' --raw | audit2allow -M my-tor
# semodule -X 300 -i my-tor.pp


Additional Information:
Source Context                system_u:system_r:init_t:s0
Target Context                system_u:object_r:tor_var_run_t:s0
Target Objects                /run/tor [ dir ]
Source                        (tor)
Source Path                   (tor)
Port                          <Unknown>
Host                          argon
Source RPM Packages           
Target RPM Packages           tor-0.2.8.7-1.fc24.x86_64
Policy RPM                    selinux-policy-3.13.1-191.16.fc24.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     argon
Platform                      Linux argon 4.7.4-200.fc24.x86_64 #1 SMP Thu Sep
                              15 18:42:09 UTC 2016 x86_64 x86_64
Alert Count                   35125
First Seen                    2016-08-23 00:46:04 CEST
Last Seen                     2016-10-02 20:56:14 CEST
Local ID                      886dcb45-1e8b-410e-afeb-263bba6691ac

Raw Audit Messages
type=AVC msg=audit(1475434574.57:9040): avc:  denied  { mounton } for  pid=24378 comm="(tor)" path="/run/tor" dev="tmpfs" ino=16985 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:tor_var_run_t:s0 tclass=dir permissive=0


Hash: (tor),init_t,tor_var_run_t,dir,mounton

Yup, so let's mark it as duplicate.

*** This bug has been marked as a duplicate of bug 1357395 ***