Wall.fm is an online service for people to build and host social networks, which is powered by Oxwall software. Wall.fm allows users over 18 years old to register a free account and create custom social networking websites. The site creation process does not involve any coding, and consists of only two steps. The distinctive Wall.fm features are user roles (member access permissions), customizable themes, activity newsfeed, website/profile/content privacy, monetization pack. One of its main competitive advantages is that the service is built on an open source platform, which means a certain degree of freedom for site owners. Wall.fm offers four plans: Free, Starter, Pro and Ultimate. Paid plans offer extended features range, additional disk space and bandwidth, individual support and vendor's branding removal.

Wall.fm was launched in February 2010, and back then was known as WackWall. The second version of WackWall, which was later renamed to Wall.fm, was powered by OpenWack software that eventually evolved into Oxwall. Wall.fm exited beta in October 2010, and started introducing paid plans and changes to free accounts, such as displaying the vendor's ads across the free plan sites, and including a site monetization pack into Ultimate plan features. On May 15, 2011 Wall.fm updated their Terms of Use limiting the use of the service to persons over 18 years old, and introducing regulations for sites intended for use by children under 13 years old. On February 27, 2012 Wall.fm announced significant changes in their pricing policy and user account interface, making subscription plans more affordable although limited in disk space/bandwidth, and site account management more user-friendly. As of May 2011, over 3000 sites are built with Wall.fm service each month.

A wall (from Old English weall) is a vertical structure, usually solid, that defines and sometimes protects an area. Most commonly, a wall delineates a building and supports its superstructure, separates space in buildings into rooms, or protects or delineates a space in the open air. There are three principal types of structural walls: building walls, exterior boundary walls, and retaining walls.

Building walls have one main purpose: to support roofs and ceilings. Such walls most often have three or more separate components. In today's construction, a building wall will usually have the structural elements (such as 2×4 studs in a house wall), insulation, and finish elements or surface (such as drywall or panelling). In addition, the wall may house various types of electrical wiring or plumbing. Electrical outlets are usually mounted in walls.

Building walls frequently become works of art externally and internally, such as when featuring mosaic work or when murals are painted on them; or as design foci when they exhibit textures or painted finishes for effect.