Non-square images can provide some unique styling issues.
This post tests a vertical featured image.
Do yourself a favour and forget the shot that someone took of you when you were at a nightclub last month, cut off just to one side where your ex was still in thephoto. There are tons ofphotos like this, and they don’t make people want to find out more! Your profile will be more attractive than if you hadn’t posted aphoto, probably, but you’re still not going to stand out from the crowd and do yourself justice. Ask yourself what you would want to see if you were a member of the target audience (usually the opposite sex), looking at your profile for the first time, and be critical.