What Facebook did is absolutely unethical. You need to make a subject aware that a psychological experiment is being done to them prior to subjecting them to it. As to the legality of it - https://twitter.com/kashhill/status/483767776427798528 - they amended their terms to include 'research' four months after the study, though in the end they have a pretty blanket T&C so I'm sure that even without this addition, there will be no lawsuit.
Personally, I wonder how this effected people's personal lives (did those that received negative news feeds also experience a more negative work/home life)? It's definitely not shocking, but it's also sad that at the end of the day there will be very little to no adverse impact to Facebook.
Glad you enjoyed the article - I'll make sure to check out your blog post on marketing automation when I get a chance. Thanks!
Great article and spot on with the best practices for LinkedIn brand pages! Thanks for the tips, particularly on your suggests of what to post on a company page.
Thank you for the compliment! I'm glad you enjoyed the article.
Nice article - is there an optimal amount of hashtags per social network? For example, the general advice for Twitter seems to be 1 - 2 hashtags, but on Instagram it seems like the more hashtags, the better.