Stalking is a serious issue and shouldn't be taken lightly, but it might not be so obvious when you encounter it. If he's lurking on your social media accounts to get information about you, is aggressive, or shows up at your home unannounced, these are all signs he's a stalker.
It can be a struggle trying to figure out what pictures to put in an online dating profile. A study has found that nearly half of women prefer men who hold this in their profile pictures.