Be careful of inadvertently advertising a competitor.
If you share curated content like news articles and blogs, be sure to read them thoroughly before posting to your company’s Facebook page or Twitter account to make sure you’re not giving a paid plug to a competitor.
I have been very close to sharing a post from a site but did a quick double-check to find that a competitor gets a big (and often paid) credit in the last paragraph.
Social Geek Blog 