When should you follow someone on Twitter? When most of us start tweeting, we follow anyone and everyone. Anyone that crops up in our friends’ timeline and definitely anyone who follows us. After a while, though, it pays to start becoming a bit more discerning. There’s only so many people you can realistically follow. At least if you want to actually read what they Tweet. Some of my best virtual friends don’t follow me because I tweet too much for their taste.