i have a button on my blog that looks like that "f" and when i put the mouse on

[jckdear]

the words "share to facebook" appear. the button itself doesnt looke like "like" or "share".my question is, can someone share my blog with a group of his choice?i'm a little confused about facebook's buttons and how they work. just a few minutes ago, i found a website i liked and pressed "like" button or "f" button, i dont remember. and a window appeared in which i was given an option to share this with a group of my choice, and i did. does the button on my blog works the same way? can anyone share it on any group he wants, even multiple groups?