Tone is very important on all social media networks and Facebook is not different. It is important to convey personality and a consistent tone on Facebook whenever possible–in fact this is across all social media platforms. It’s pretty easy to achieve — if it’s authentic.
What many of the most successful social media marketers do is distill their personalities and interests down to a few key themes. Think about your key themes. What do you care about? Who are you trying to reach? What topics do they care about? What is your goal on Facebook? Notice what posts & reposts resonate with your social network. Stick to these and you will be just fine!