Twitter is a popular social media service that allows users to find the latest world events and interact with other users through various types of message content (tweets). Twitter can be accessed through a website interface, applications installed on mobile devices, or a short message service (SMS).

API functions: Twitter provides various API endpoints to accomplish different tasks. For example, you can use the Search API to retrieve historical tweets, the Account Activity API to access account activities, the Direct Message API to send direct messages, the Ads API to create advertising campaigns, and the Embed API to insert tweets into your web application.

Popularity: Twitter is a very popular social media service that can help boost engagement for your app. At the end of 2018, it had over 335 million monthly active users.

Price: Twitter provides its APIs for free. However, if you need a high level of access and reliability, you will need to contact them to get paid versions of the APIs.

Ease of use: Twitter APIs are very easy to use. Twitter provides comprehensive documentation to help you seamlessly integrate any of its APIs into your specific use case.