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.
A poor follower-to-following ratio
Keeping up with a bunch of interesting accounts is fine, but you always want to keep your "followers" total higher than the number of accounts you follow. If the scale starts to dip in the other direction, then that’s a giveaway that this individual is as basic as it gets. If a girl follows 600 people and only has 150 followers, I can pretty much guarantee that she loves the Kardashians, reads Cosmo every month, and goes to Starbucks daily. It’s just science. She’ll probably tell you how she’s different from other girls because she loves pizza and finds Chris D’Elia hilarious. If a guy has the same ratio, I can pretty much assure you that he finds Vine comedians hilarious, chugs a ton of Monster energy drinks, and installed his own stereo in his car.