Remember that when you are using images that are not your own (i.e. photos or videos you created locally) to check on whether or not they are copyrighted or free-use/public-domain. 

Consider making your own “stock-file” of photos to use with posts, to created memes, and for use with publicity of future events. 

More is not always better with social media both in number of platforms and frequency of posts. 

Please remember that if you are using stock images (from any source aside from your own local creations), make sure you check on the way they want the work credited