This is The TechCrunch Exchange, a newsletter that goes out on Saturdays, based on the column of the same name. You can sign up for the email here. Welcome to a special Thanksgiving edition of The Exchange. Today we will be brief. But not silent, as there is much to talk about. Up top, The Exchange noodled on the Slack-Salesforce deal here, so please catch up if you missed that while eating pie for breakfast yesterday. And, sadly, I have no idea why Palantir is seeing its value skyrocket. Normally we’d discuss…