Blocking Referral Spam within your .htaccess

.htaccess

# Make sure our server has the rewrite module active.
# (This is very standard - it almost certainly will)
<IfModule mod_rewrite.c>

# Let the system know we’re configuring redirections here
RewriteEngine on

# Now let’s list our redirections (technically these are known as “Rewrite Conditions”.)

RewriteCond %{HTTP_REFERER} ^http://.*referrerurlone\.com/ [NC,OR]
RewriteCond %{HTTP_REFERER} ^http://.*referrerurltwo.\.ru/ [NC,OR]
# We can include as many copies of this line as we need to cover each url.
# The NC flag tells this to be case-insensitive and the OR tells the browser 
# to move on to the next rule if this condition isn’t met.

# Bring it all together here - this line tells the browser to forbid access then
# down tools if one of the conditions we listed above is matched.
RewriteRule ^(.*)$ – [F,L]

</IfModule>