Sometimes, now and then, someone on Facebook or G+ posts an image of someone liking every one of their posts, which they’re a little concerned about, sometimes they find it a bit creepy.
It’s true, it can come across that way, it feels a bit like someone following you so closely that you can feel their breath on your neck.
There’s likely little to be worried about, in all likelihood they’re just a fan.
They really like you, and love all your posts, but might also see you as a bit of a rock star, and therefore won’t say anything to you for fear of embarrassing themselves.
About the best thing you can do is write back and thank them for enjoying your posts, and invite them to comment, which is a bit like offering a shy person tea and biscuits, and a chair where they can sit, mix in, and feel welcome.