will verizon charge extra if i get facebook mobile texts for my phone?

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i have the lg cosmos and i just have unlimited texting from verizon to verizon plus 500 pix messaging. i dont have a data package or anything so if i get in the internet it just charges me per use. what i need to know is if verizon will charge me extra if i were to get that facebook mobile text messaging where you can post something from your phone and receive texts when people post on your wall and stuff? or do the facebook texts not count as verizon to verizon? i just dont want to get charged anything extra please help if you know anything about it thank you