Apparently there’s one four-letter word that “does great damage to way too many people.”
No, not that word. This one is “like.”
So says Edward Good, the developer of grammar.com; check out the excellent (and very short) article on this subject by Joe McVeigh for some incisive observations on Good’s obnoxious work, which you can read (with McVeigh’s comments) here.
If Good were behind some randomly named website, I wouldn’t mind so much. But there are “way too many people” who believe everything they see on the Internet, and any site with a simple name like “grammar.com” just automatically seems authoritative to them.