Foursqure co-founder Dennis Crowley wasn’t too happy with the rather blatant ripoff by Yelp of its check-in feature. Yelp vs. Foursquare could be an interesting battle over local online advertising dollars.

Read More: Foursquare Yelps over Check-in Feature Knockoff

Advertise. Market. Spam. Promote. Sell. Messaging. Script. Cajole. Spam. Lie. These are all words people think of when they think of marketing. It’s time to put “trust” on the list.

Read More: Trust Marketing