Most RuneScape players speak English. Players who speak languages other than English tend to gravitate to servers populated by other players who speak the same language. Some worlds have larger numbers of players who speak Spanish, Dutch, French, German, or other languages. It is not uncommon, however, to see many languages on the chat screen throughout RuneScape. A German translation of RuneScape has also been released, while a French version of the game is in production.

A set of official forums is provided by Jagex on the RuneScape website. On the forums, members are able to participate in game discussions, play player-made forum games, arrange to buy or sell items, post suggestions for further game improvements, vote in polls and otherwise interact with the community. Free players can read the forums, but posting is reserved for paying members. Unlike many MMORPG official forums, the RuneScape forums have very limited features. User profiles do not exist and a user cannot set an avatar, signature, or separate display name. Users cannot use text formatting, post url address links, nor display images. A topic is automatically and permanently deleted after it surpasses the fiftieth page, so during busier times of the day, a topic can be deleted as quickly as a few minutes unless it is constantly "bumped".

Players can submit email questions to any non-player character in the game. Selected letters are answered in a monthly update called Postbag from the Hedge. This feature began on 26 September 2005 and has since become one of the most accessed pages of the site. Beginning 24 September 2002, players could submit questions to the RuneScape gods; however, this feature was discontinued on 9 December 2004. Players can also submit original RuneScape related artwork, some of which is displayed in a gallery on the RuneScape website. Media featured have included sculpture, comics, drawings, and paintings.

Many RuneScape fansites have been established by players, none of which are supported or recognized by Jagex. Although in the early days of RuneScape the official website had a links page which listed several fansites, this is no longer the case. In order to provide players with an alternative, official site to get the information they want or need, Jagex introduced the Knowledge Base, which offers information on gameplay, the main RuneScape rules, and account security. Jagex discourages the discussion of fansites within the game or the official forums - chanand a rule specifically prohibits sharing web addresses. At least one major fansite has criticised Jagex for not recognising fansites' contributions to the development of its game.

Rules and cheating
 
The three crowns of each type of moderator.Jagex has put in place a number of rules for player conduct, such as rules against offensive language, scamming, and bug abuse. To enforce the rules, RuneScape uses three types of moderators: Jagex moderators, who are actual Jagex employees; player moderators, who are trusted ordinary players that enforce the rules within the game; and forum moderators, who are trusted players who police the game forums. On the forums, Jagex moderators are identified by gold crowns and backgrounds on their posts while forum moderators have green crowns and backgrounds; in game, Jagex moderators have gold crowns next to their names in chat while player moderators have silver crowns. In addition, any player has the ability to report rule-breaking using a "report abuse" feature; misuse of this feature can result in action being taken against the reporter. The effectiveness of Jagex's pursuit of abusers has been debated in an article posted on Twitchguru.

There are also rules prohibiting the use of third-party software to play the game, known as macroing, and the sale of game items for real money, known as real-world or real-money trading. In the early days of the game, most cheaters were individual players using special programs that exploited weaknesses in the game's client-server communications by sending false data to the server. In response, Jagex made direct interaction with the client very difficult. Players then began using macro programs to automate mouse clicks for repetitive tasks. Random events, requiring human reaction and decision making, are one method Jagex implemented to attempt to disrupt such programs. However, the human interaction required in random events has been successfully emulated by macro programs. According to Jagex, many cheaters are now based in game sweatshops in China, making gold to sell to players for real-world money, also an issue in many other MMORPGs (see gold farming). In response, Jagex issued a statement condemning real-world trading. In the statement, they also claimed that they were seizing billions of gold and banning thousands of accounts every week for cheating. Nevertheless, real-world trading and macroing activities still continued.

From October 2007 to December 2007, Jagex began a war on real-world trading by releasing a series of drastic updates to restrict unbalanced trades. These updates established the Grand Exchange, limited the value of items staked in duels, removed player killing from the Wilderness, made valuable player drops invisible to other players, introduced gravestones for the items of dead players, and instituted the LootShare, CoinShare, and player-assist systems. Collectively, these changes were designed to make it extremely difficult for real-world money sellers to distribute gold and items to players. These changes were criticized by many players, some of whom started virtual (in game) "riots", angrily protesting the changes. Jagex issued a Customer Support News article explaining that the updates were a tough decision, admitting that the updates may not have been an ideal replacement for what was removed, requesting patience, and promising to remedy potential problems with updates in the future. Dissatisfaction with the updates caused the departure of 60,000 subscribers.