It’s 100% selfies
If you only take photos of yourself, it doesn't take much to discern that you're probably a bit (or more than a bit) of a narcissist. It means he or she is way too into himself/herself. If I’m creeping on a girl, I want to at least see what she’s been eating, where she’s been going out, what she’s been watching, where she’s been traveling, or something, anything, beyond what her duck face and peace sign games look like. Substance, people!
Too few -- or too many -- followers
This is a tricky one, because I don’t want to generalize and there are absolutely exceptions to this rule. However, I would recommend staying within the 1,000- to 10,000-follower range. For starters, anyone with more than 1,000 followers (and who isn’t following nearly as many people) will most likely be classified as “universally attractive.” Anyone with more than 10,000 followers will most likely take themselves (or their online presence) too seriously and probably knows all too well how attractive they are. These people will be quick to dismiss you or cut you off because there is literally a limitless lineup of possible suitors vying for their attention. Anything you think you can provide to them, they can go online and find within eight seconds. Consider the 1,000 to 10,000 range the safe zone.