Most auto posters get your account banned on Facebook, twitter and other social auto posters some do work good but only for a limited time and then you get your account suspended and investigated. If your going to use auto poster software your best making sure you are using a burner Facebook account so that way you are not going to get your main one banned. Or you might be better at looking at ones that are risk free and do not get you banned. If wanting to start maybe look at
http://thebot.net/ has tuns of auto posting and scripts and bots but I take no responsibility in it used lots of stuff off it past and present but I do not condone it. Use their stuff at own risk. If no use on their then best bet is google and youtube.