If you have lots of posts keep organised
On GOOGLE DOCS I have all my posts/ pages/videos listed ---( well in process of)
and categorised to which website
Easy to see
-which social media i have shared to
even which subreddit so i can remember
If there are gaps I can go back and share to places i have missed, or sort according to any column.
I find it helpful --- maybe others will . I have 70 posts on each 3 websites so i must now keep track of them!!