Unless your main focus on Steemit is curation, and have a page that focuses on Resteeming other folks' content, be aware of how much you Resteem...everything you resteem to your page shows up in the feeds of everyone who Follows you.
Look at your page: if you have to scroll down a bit to find your latest post from a few minutes/hours/days ago, perhaps you are Resteeming a little too much.
I know you want to be supportive, believe me...but put it on a scale. If it doesn't weigh out, don't share it. Set a curative bar.
Upvotes, discussion and discourse in the comments, and shares on other social media help very much, as well as support the growth of the Steemit platform on a larger scale.
In my own experience, it comes down to being selective. There are no rules here, per se, so do whatever you want, take all the advice for what it is or isn't worth to you...and of course everyone wants everyone to Resteem everything they do so they're paid more, but especially with the hardfork coming and votes worth more, remember to be selective in the content you choose to Resteem/curate, and remember that it can bury your own content in the feeds of your Followers, sometimes to the detriment of folks missing your real content, all the way to people Unfollowing you because you, "clog up their feeds."
Lately, I have had a specific focus on Resteeming posts related to the Steemit Local Music Society opening on Friday, as well as particularly selected, stand-out posts among new members I have helped into the platform to expose them to a larger audience, or the occasional gluttonous sharing of contests which require shares for entry...other than that, I try not to.
Some people curate their favorite posts of the week into one place, write a great article about what they loved about each article and why, and feature people that way...cross-promotion focused, curated posting is a great and sometimes underutilized method.
(Woo hoo anarchy and stuff)
Same thing goes for who you follow. Don't let others miss, nor miss the content of others because of spammy feeds.
Original Cover Image Source...before I killed it with incredibly poor editing.