Here’s a good overview by Rand Fishkin (Moz) who presents his summary of what to love and what to leave in SEO for 2015.
The first example in the article really drives it home. Even if you don’t have a social media strategy yourself, or are not active on social media, others that talk to you are, and they may quote whatever you say to them on twitter or in the blogosphere.
Thank about it next time you’re at a conference. Would you want your boss, co-workers or customers to read what you just said?