I generally share most of my non-steem centered steem content on facebook and twitter. For facebook it's just to get that one extra SEO link for twitter, there is some good engagement with steem people.
I usually delay it a day or two.
Not sure I want to add all of these comments and tags to my steem posts, but I will think about it.
I will try to remember to use the steem tag with posts on Twitter's end. Hell, ill do it now