Social commerce is a subset of electronic commerce that involves using social media, online media that supports social interaction and user contributions, to assist in the online buying and selling of products and services.
From Wikipedia definition

Elgg Social Commerce PRO is a fully featured ecommerce plugin for elgg, the award winning open source social networking platform. Social Commerce PRO empowers elgg with a great revenue model by adding an ecommerce store into it. Elgg Social Commerce PRO is the best solution to create social ecommerce applications.

Members can Buy & Sell products

Single page checkout

Email order notification

Integrated with activity stream and wire

Can integrate more payment options

Can integrate more shipping options

Modular design

Support physical, digital products

HTTP & HTTPS checkout

Related products

Out of stock emails

Different Tax options

Sellers can withdraw funds to their paypal account.

List and gallery view of products shows there

Create orders manually

Manage wishlist

Integrated with Cubet Membership plugin

Admin and members can create coupons for their stores

Admin can manage every functionality

Administrator can opt to disable user stores

Administrator can charge a commission on the sales

Social commerce is the business model for the decade. With the advent of social media, tapping social networking tools to connect online customers with each other as they shop, can help companies monetize their investment in social networks, according to market observers.

Why Social Commerce PRO

Why Us? :

Install and Configure in minutes.

Completely Browser based.

100% Open Source, You can modify your code.

SEO Friendly URLs

Works on your Mobile

Easily Integrated with your Elgg Themes

Over 500 live stores.