You have been getting nofollow links from most of the social media channels. Getting nofollow links are kind of useless. However, your website can get so much referral traffic from social media channels. We do blog promotion, forum posting, PR promotion to get backlinks and SEO value.
It is not bad to get backlinks to your website from social media sites, but it will be best to get backlinks from the website of your niche because the value of link got from your niche has been high comparing to the backlink got from the socialmedia websites.