social media platforms

There are so many social media platforms that people can use for both personal and professional use for an example many cosmetic companies have taken social media by storm with feeds in Instagram, Facebook and even Tumblr.  I find myself using my professional Facebook account for keeping in touch with family because they have to be linked together and use Instagram more as a personal creative outlet. I have seen companies who have creative Tumblr accounts to promote their businesses, but also as a means to be update in current events. I don't think there is a difference between which one can be used for what now a days when social media is such a strong means for promoting, outreach and marketing.