Imagine if everyone who wrote you an email could see into the deepest core of your personality.Yeah, it's not that far away: We found a service called Crystal Knows that takes the trend toward "personalization" (think crazy-targeted Facebook ads and Amazon items that follow you from sidebar to sidebar) up a notch, turning your online data into a sort of all-purpose communication coach. On this week's episode of Note to Self — the podcast formerly known as New Tech City! — we dive deep into Crystal, which claims to be able to read a person's personality based on what they've written and shared online. It's marketed as a tool for writing more personalized emails, catered toward the recipients' particular communication style.  Here's more on how it works: We had to test it. So we sent some Crystal Knows-optimized emails to public radio "personalities," as they're called, asking them to weigh on on Crystal's assessment of their... personalities.  Here's what they said: Brooke Gladstone, Co-Host of On the Media: Crystal says: "Brooke is very direct in verbalizing concerns and will not leave anything up for interpretation, so occasionally will say something too bluntly as a result." Brooke says: "Some of these things are so true it’s scary. I do tend to be blunt in a way that may accidentally offend people . I do tend to challenge bold claims.  I do ask lots of questions. But some things I don’t recognize at all.  For instance,  unlike the profile, I really do like metaphors, I do seek consensus, and I often do act  as a mediator. This may be good advice to a marketer, but it’s not a very accurate assessment of a person."  Jad Abumrad, Co-Host of Radiolab: Crystal says:  "Jad is social, creative, trusts feelings and gut instinct more than rules or logic, and loves talking about ideas." Jad says: "Wha??   I'm glad whatever algorithm this is incorrectly believes me to be social, but I hate ideas and feelings are the enemy." Ira Flatow, Host of Science Friday: Crystal says: "Ira is a creative influencer: forward-thinking, ambitious, easily distracted, and makes quick decisions that can seem unpredictable." Ira says: "I think that the profile has merit. The qualities of my personality are flattering. I’d comment further but I’m being distracted…sorry, you want what?"  Jeremy Hobson, Co-Host of Here & Now: Crystal says: "Jeremy is friendly but naturally skeptical, appreciates informal conversation and gets bored very easily."   Jeremy says: "It’s not totally accurate but I’m pretty impressed. Friendly but naturally skeptical, check. I definitely appreciate informal conversation. And I do get bored by things I’ve heard before. One thing it’s wrong about is that I lose track of time while working – I’d never survive in the live radio business if that were the case! How it got all this information, I would love to know. It’s kind of spooky." Steve Henn, NPR's Technology Correspondent, Planet Money: Crystal says: "Steve is social, creative, trusts feelings and gut instinct more than rules or logic, and loves talking about ideas." Steve says: "I just started laughing at this line; "trusts feelings and gut instinct more than rules or logic."  I hope tha...