you can spoof sms verification for twitter and gmail/youtube verification. A lot of free sites but the numbers are grabbed fast. You can but a number through bitcoin to maek it anonymous many many pva sites.
Here are the free ones(not recent list i made this in march there is new ones plus some of these don't work anymore). Gonna try and make a few troll accounts fuck it.
http://Freevirtualnumber.skycallbd.com
http://Getfreesmsnumber.com
http://Getsms.org
http://hs3x.com
http://Hs3x.com
http://Ireceivesmsonline.com
http://lleida.net/uk
http://Mfreesms.com
http://Mytrashmobile.com
http://Numberforsms.com
http://Onlinesim.ru
http://onlinesim.ru/sms-receive
http://pinger.co
http://Proovl.com
18034706508.php">http://pumpsms.com18034706508.php