MySQL Optimization for more traffic

Hello I have a problem with my configuration mysql. This is my configuration : 1x Intel" Xeon" E3 1230 v3 4 c"urs 8 threads @3.3 Ghz cache L3 8MB, x64, VT 32 Go DDR3 ECC link : - Removed - I have more trafic on my website if i share a post on my Facebook page. I have many Facebook page ( 12M total ) When i have 3000 visit online, my website is very very slow ... This is my MySQLTuner :


-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.5.38-0+wheezy1
[OK] Operating on 64-bit architecture

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in InnoDB tables: 10M (Tables: 22)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17)
[!!] Total fragmented tables: 22

-------- Security Recommendations  -------------------------------------------
[OK] All database users have passwords assigned

-------- Performance Metrics -------------------------------------------------
[--] Up for: 2h 35m 10s (698K q [75.009 qps], 11K conn, TX: 4B, RX: 78M)
[--] Reads / Writes: 80% / 20%
[--] Total buffers: 18.1G global + 18.6M per thread (3000 max threads)
[!!] Maximum possible memory usage: 72.5G (231% of installed RAM)
[OK] Slow queries: 0% (0/698K)
[OK] Highest usage of available connections: 0% (15/3000)
[OK] Key buffer size / total MyISAM indexes: 2.0G/97.0K
[OK] Query cache efficiency: 87.7% (554K cached / 633K selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 1K sorts)
[!!] Joins performed without indexes: 6630
[!!] Temporary tables created on disk: 28% (379 on disk / 1K total)
[OK] Thread cache hit rate: 98% (227 created / 11K connections)
[OK] Table cache hit rate: 21% (79 open / 374 opened)
[OK] Open file limit used: 0% (48/81K)
[OK] Table locks acquired immediately: 100% (81K immediate / 81K locks)
[OK] InnoDB data size / buffer pool: 10.1M/4.0G

-------- Recommendations -----------------------------------------------------
General recommendations:
    Run OPTIMIZE TABLE to defragment tables for better performance
    MySQL started within last 24 hours - recommendations may be inaccurate
    Reduce your overall MySQL memory footprint for system stability
    Enable the slow query log to troubleshoot bad queries
    Adjust your join queries to always utilize indexes
    Temporary table size is already large - reduce result set size
    Reduce your SELECT DISTINCT queries without LIMIT clauses
Variables to adjust:
  *** MySQL's maximum memory usage is dangerously high ***
  *** Add RAM before increasing MySQL buffer variables ***
    join_buffer_size (> 16.0M, or always use indexes with joins)

This is a my my.cnf settings:

# The MySQL database server configuration file.

# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port            = 3306
socket          = /var/run/mysqld/mysqld.sock

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

[mysqld]
#
# * Basic Settings
#
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address            = 127.0.0.1
#
# * Fine Tuning
#
key_buffer              = 2G
max_allowed_packet      = 64M
thread_stack            = 192K
thread_cache_size       = 8
tmp_table_size = 4G
max_heap_table_size = 4G
open-files-limit = 81920
join_buffer_size = 16M
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = backup,force
max_connections        = 3000
table_cache            = 1024
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit       = 2M
query_cache_size        = 100M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1
#
# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf.
#
# Here you can see queries with especially long duration
#log_slow_queries       = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id              = 1
#log_bin                        = /var/log/mysql/mysql-bin.log
expire_logs_days        = 10
max_binlog_size         = 500M
#binlog_do_db           = include_database_name
#binlog_ignore_db       = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#

innodb_buffer_pool_size        = 4G
innodb_additional_mem_pool_size = 4G
innodb_log_buffer_size = 4G
innodb_write_io_threads=4
innodb_read_io_threads=4

# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
[mysqldump]
quick
quote-names
max_allowed_packet      = 64M

[mysql]
#no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer              = 2G

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

What Can I do? Please give me some advise. Thank you very much, p.s: I'm so sorry, My English is not good.

MySQL Optimization for more traffic

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