Identi.ca is an open source social networking and microblogging service that uses the pump.io software and the Activity Streams protocol. Identi.ca allows users to post and comment on various types of content, such as text, images, videos, and links. Identi.ca was launched in2008 by Evan Prodromou.

identi.ca is based on the pump.io software, that uses the Activity Streams protocol and does most of what people want from a social network. The website allows unlimited length status updates, rich text, and images.

Identi.ca stopped accepting new registrations in 2013. However, it continues to operate alongside several other pump.io-based hosts. Pump.io is a decentralized social network with servers where users can pick where to sign up for an account, and communicate with Pump users from any other public Pump.io server. Identi.ca is a free and open-source microblogging service. It is based on the Activity Streams protocol, which allows users to share their activities with other users on different microblogging platforms. Identi.ca users can post text, links, images, and videos. They can also follow other users and comment on their posts. Identi.ca is a decentralized service. This means that there is no central server that stores all of the user data. Instead, the data is stored on individual servers that are run by different users.

• Choose a username that reflects your identity. Your username is how other users will identify you on identi.ca, so it's important to choose a username that reflects your identity. If you want to use a pseudonymous username, that's fine, but make sure it's something that you're comfortable with.
• Set your privacy settings. identi.ca gives you a lot of control over your privacy settings. You can choose who can see your posts, who can follow you, and who can send you messages. It's important to set your privacy settings so that you feel comfortable with how your information is shared.
• Use the Activity Streams protocol. identi.ca is an Activity Streams-enabled platform, which means that you can share your activities with other users on different microblogging platforms. If you want to share your identi.ca posts with other users on Twitter or Facebook, you can do so by using the Activity Streams protocol.
• Be active. The more active you are on identi.ca, the more people will see your posts and interact with you. Post regularly, comment on other people's posts, and participate in discussions.
• Use hashtags. Hashtags are a great way to get your posts seen by more people. When you use relevant hashtags, your posts will show up in search results for those hashtags.
• Share high-quality content. People are more likely to engage with your content if it's high-quality. This means sharing interesting, informative, and engaging content.
• Be respectful. identi.ca is a community of people who are interested in sharing their thoughts and ideas. It's important to be respectful of other users' opinions and to avoid making personal attacks.

By use of Identi.ca site users get unlimited length status updates, rich text, and images. As well, the Activity Streams protocol provides many kinds of activities such as games.

Check out a "public timeline" at hubub.e43.eu, hubub.polari.us or from a client that supports.

Check out a pseudo-user directory at inventati.org/ppump/usuarios.

Take advantage of tools such as Spigot, to post to Pump automatically from RSS feed, or PumpTweet, to automatically send Pump.io posts to Twitter.

Use pump.io to follow people from any other public Pump.io server, like microca.st, hotpump.net, fmrl.me, pump.jpope.org via http://www.inventati.org/ppump/usuarios/