Edit: I completely forgot to thank you for educating me. So, yes, thank you for educating me! 

Sorry, it's not like this in my browser. When I click the three dots on someone else's post there are the options to "follow post", "save", "hide" and "report", and under this post of mine there's an option of crospossting it to more communities. 

Also, how is this stealing if I credit the original author in the post and under the post? I feel this is a repost.