CheckN: Social in Social Media is a free iPhone app developed by CheckN Holdings Inc. It falls under the category of Social & Communication, specifically social networking.

The app provides real-time information about the hottest places and venues in your area. It allows you to see where everyone in your extended friend group is at any given moment. Additionally, it shows thumbnail pictures of people you haven't met yet who are currently at a specific location. The app even provides the ratio of men to women at each venue.

CheckN lets you customize your search by selecting the types of places you're interested in, such as bars, clubs, restaurants, parks, and museums. You can also choose your desired neighborhood or geography. Once you arrive at a venue, you can use CheckN to browse through thumbnail photos of other checked-in users, filtering by age and gender to see who else is there.

The app offers privacy features like "Go-anonymous" or "Only friends can see me." It also allows users to receive exclusive deals from venues, including concerts and sports events.

CheckN: Social in Social Media is the perfect solution for those who want to know where all the people are and never miss out on the action.